diff --git a/verilog/analysis/checkers/BUILD b/verilog/analysis/checkers/BUILD
index f723853cd..fdbacba89 100644
--- a/verilog/analysis/checkers/BUILD
+++ b/verilog/analysis/checkers/BUILD
@@ -1673,7 +1673,6 @@ cc_library(
         "//common/analysis:syntax-tree-lint-rule",
         "//common/analysis/matcher",
         "//common/analysis/matcher:bound-symbol-manager",
-        "//common/strings:naming-utils",
         "//common/text:config-utils",
         "//common/text:symbol",
         "//common/text:syntax-tree-context",
@@ -1686,6 +1685,7 @@ cc_library(
         "@com_google_absl//absl/status",
         "@com_google_absl//absl/strings",
         "@com_google_absl//absl/strings:string_view",
+        "@com_googlesource_code_re2//:re2",
     ],
     alwayslink = 1,
 )
@@ -1699,6 +1699,9 @@ cc_test(
         "//common/analysis:syntax-tree-linter-test-utils",
         "//verilog/analysis:verilog-analyzer",
         "//verilog/parser:verilog-token-enum",
+        "@com_google_absl//absl/status",
+        "@com_google_absl//absl/strings",
+        "@com_google_absl//absl/strings:string_view",
         "@com_google_googletest//:gtest",
         "@com_google_googletest//:gtest_main",
     ],
diff --git a/verilog/analysis/checkers/parameter_name_style_rule.cc b/verilog/analysis/checkers/parameter_name_style_rule.cc
index 1c6cbedc5..f9f24481e 100644
--- a/verilog/analysis/checkers/parameter_name_style_rule.cc
+++ b/verilog/analysis/checkers/parameter_name_style_rule.cc
@@ -15,9 +15,9 @@
 #include "verilog/analysis/checkers/parameter_name_style_rule.h"
 
 #include <cstdint>
+#include <memory>
 #include <set>
 #include <string>
-#include <utility>
 #include <vector>
 
 #include "absl/status/status.h"
@@ -26,11 +26,11 @@
 #include "common/analysis/lint_rule_status.h"
 #include "common/analysis/matcher/bound_symbol_manager.h"
 #include "common/analysis/matcher/matcher.h"
-#include "common/strings/naming_utils.h"
 #include "common/text/config_utils.h"
 #include "common/text/symbol.h"
 #include "common/text/syntax_tree_context.h"
 #include "common/text/token_info.h"
+#include "re2/re2.h"
 #include "verilog/CST/parameters.h"
 #include "verilog/CST/verilog_matchers.h"
 #include "verilog/analysis/descriptions.h"
@@ -40,26 +40,47 @@
 namespace verilog {
 namespace analysis {
 
+VERILOG_REGISTER_LINT_RULE(ParameterNameStyleRule);
+
 using verible::LintRuleStatus;
 using verible::LintViolation;
 using verible::SyntaxTreeContext;
 using Matcher = verible::matcher::Matcher;
 
-// Register ParameterNameStyleRule.
-VERILOG_REGISTER_LINT_RULE(ParameterNameStyleRule);
+// Upper Camel Case (may end in _[0-9]+)
+static constexpr absl::string_view kUpperCamelCaseRegex =
+    "([A-Z0-9]+[a-z0-9]*)+(_[0-9]+)?";
+// ALL_CAPS
+static constexpr absl::string_view kAllCapsRegex = "[A-Z_0-9]+";
+
+static constexpr absl::string_view kLocalparamDefaultRegex = "";
+static constexpr absl::string_view kParameterDefaultRegex = "";
+
+ParameterNameStyleRule::ParameterNameStyleRule()
+    : localparam_style_regex_(std::make_unique<re2::RE2>(
+          absl::StrCat("(", kUpperCamelCaseRegex, ")"), re2::RE2::Quiet)),
+      parameter_style_regex_(std::make_unique<re2::RE2>(
+          absl::StrCat("(", kUpperCamelCaseRegex, ")|(", kAllCapsRegex, ")"),
+          re2::RE2::Quiet)) {}
 
 const LintRuleDescriptor &ParameterNameStyleRule::GetDescriptor() {
   static const LintRuleDescriptor d{
       .name = "parameter-name-style",
       .topic = "constants",
       .desc =
-          "Checks that non-type parameter and localparam names follow at least "
-          "one of the naming conventions from a choice of "
-          "CamelCase and ALL_CAPS, ORed together with the pipe-symbol(|). "
-          "Empty configuration: no style enforcement.",
-      .param = {{"localparam_style", "CamelCase", "Style of localparam name"},
+          "Checks that parameter and localparm names conform to a naming "
+          "convention based on a choice of 'CamelCase', 'ALL_CAPS' and a user "
+          "defined regex ORed together. Empty configurtaion: no style "
+          "enforcement. Refer to "
+          "https://github.com/chipsalliance/verible/tree/master/verilog/tools/"
+          "lint#readme for more detail on verible regex patterns.",
+      .param = {{"localparam_style", "CamelCase", "Style of localparam names"},
                 {"parameter_style", "CamelCase|ALL_CAPS",
-                 "Style of parameter names"}},
+                 "Style of parameter names."},
+                {"localparam_style_regex", std::string(kLocalparamDefaultRegex),
+                 "A regex used to check localparam name style."},
+                {"parameter_style_regex", std::string(kParameterDefaultRegex),
+                 "A regex used to check parameter name style."}},
   };
   return d;
 }
@@ -69,21 +90,16 @@ static const Matcher &ParamDeclMatcher() {
   return matcher;
 }
 
-std::string ParameterNameStyleRule::ViolationMsg(absl::string_view symbol_type,
-                                                 uint32_t allowed_bitmap) {
-  // TODO(hzeller): there are multiple places in this file referring to the
-  // same string representations of these options.
-  static constexpr std::pair<uint32_t, const char *> kBitNames[] = {
-      {kUpperCamelCase, "CamelCase"}, {kAllCaps, "ALL_CAPS"}};
-  std::string bit_list;
-  for (const auto &b : kBitNames) {
-    if (allowed_bitmap & b.first) {
-      if (!bit_list.empty()) bit_list.append(" or ");
-      bit_list.append(b.second);
-    }
-  }
-  return absl::StrCat("Non-type ", symbol_type, " names must be styled with ",
-                      bit_list);
+std::string ParameterNameStyleRule::CreateLocalparamViolationMessage() {
+  return absl::StrCat(
+      "Localparam name does not match the naming convention ",
+      "defined by regex pattern: ", localparam_style_regex_->pattern());
+}
+
+std::string ParameterNameStyleRule::CreateParameterViolationMessage() {
+  return absl::StrCat(
+      "Parameter name does not match the naming convention ",
+      "defined by regex pattern: ", parameter_style_regex_->pattern());
 }
 
 void ParameterNameStyleRule::HandleSymbol(const verible::Symbol &symbol,
@@ -92,43 +108,132 @@ void ParameterNameStyleRule::HandleSymbol(const verible::Symbol &symbol,
   if (ParamDeclMatcher().Matches(symbol, &manager)) {
     if (IsParamTypeDeclaration(symbol)) return;
 
-    const auto param_decl_token = GetParamKeyword(symbol);
+    const verilog_tokentype param_decl_token = GetParamKeyword(symbol);
 
     auto identifiers = GetAllParameterNameTokens(symbol);
 
     for (const auto *id : identifiers) {
-      const auto param_name = id->text();
-      uint32_t observed_style = 0;
-      if (verible::IsUpperCamelCaseWithDigits(param_name)) {
-        observed_style |= kUpperCamelCase;
-      }
-      if (verible::IsNameAllCapsUnderscoresDigits(param_name)) {
-        observed_style |= kAllCaps;
-      }
-      if (param_decl_token == TK_localparam && localparam_allowed_style_ &&
-          (observed_style & localparam_allowed_style_) == 0) {
-        violations_.insert(LintViolation(
-            *id, ViolationMsg("localparam", localparam_allowed_style_),
-            context));
-      } else if (param_decl_token == TK_parameter && parameter_allowed_style_ &&
-                 (observed_style & parameter_allowed_style_) == 0) {
-        violations_.insert(LintViolation(
-            *id, ViolationMsg("parameter", parameter_allowed_style_), context));
+      const auto name = id->text();
+      switch (param_decl_token) {
+        case TK_localparam:
+          if (!RE2::FullMatch(name, *localparam_style_regex_)) {
+            violations_.insert(LintViolation(
+                *id, CreateLocalparamViolationMessage(), context));
+          }
+          break;
+
+        case TK_parameter:
+          if (!RE2::FullMatch(name, *parameter_style_regex_)) {
+            violations_.insert(
+                LintViolation(*id, CreateParameterViolationMessage(), context));
+          }
+          break;
+
+        default:
+          break;
       }
     }
   }
 }
 
+absl::Status ParameterNameStyleRule::AppendRegex(
+    std::unique_ptr<re2::RE2> *rule_regex, absl::string_view regex_str) {
+  if (*rule_regex == nullptr) {
+    *rule_regex = std::make_unique<re2::RE2>(absl::StrCat("(", regex_str, ")"),
+                                             re2::RE2::Quiet);
+  } else {
+    *rule_regex = std::make_unique<re2::RE2>(
+        absl::StrCat((*rule_regex)->pattern(), "|(", regex_str, ")"),
+        re2::RE2::Quiet);
+  }
+
+  if ((*rule_regex)->ok()) {
+    return absl::OkStatus();
+  }
+
+  std::string error_msg = absl::StrCat("Failed to parse regular expression: ",
+                                       (*rule_regex)->error());
+  return absl::InvalidArgumentError(error_msg);
+}
+
+absl::Status ParameterNameStyleRule::ConfigureRegex(
+    std::unique_ptr<re2::RE2> *rule_regex, uint32_t config_style,
+    std::unique_ptr<re2::RE2> *config_style_regex) {
+  absl::Status s;
+
+  int config_style_regex_length = (*config_style_regex)->pattern().length();
+
+  // If no rule is set, no style enforcement
+  if (config_style == 0 && config_style_regex_length == 0) {
+    // Set the regex pattern to match everything
+    *rule_regex = std::make_unique<re2::RE2>(".*", re2::RE2::Quiet);
+    return absl::OkStatus();
+  }
+
+  // Clear rule_regex
+  *rule_regex = nullptr;
+
+  // Append UpperCamelCase regex to rule_regex (if enabled)
+  if (config_style & kUpperCamelCase) {
+    s = AppendRegex(rule_regex, kUpperCamelCaseRegex);
+    if (!s.ok()) {
+      return s;
+    }
+  }
+
+  // Append ALL_CAPS regex to rule_regex (if enabled)
+  if (config_style & kAllCaps) {
+    s = AppendRegex(rule_regex, kAllCapsRegex);
+    if (!s.ok()) {
+      return s;
+    }
+  }
+
+  // Append regex from config_style_regex (if provided by the user)
+  if (config_style_regex_length > 0) {
+    s = AppendRegex(rule_regex, (*config_style_regex)->pattern());
+  }
+
+  return s;
+}
+
 absl::Status ParameterNameStyleRule::Configure(
     absl::string_view configuration) {
-  // TODO(issue #133) include bitmap choices in generated documentation.
-  static const std::vector<absl::string_view> choices = {
-      "CamelCase", "ALL_CAPS"};  // same sequence as enum StyleChoicesBits
+  // same sequence as enum StyleChoicesBits
+  static const std::vector<absl::string_view> choices = {"CamelCase",
+                                                         "ALL_CAPS"};
+
+  uint32_t localparam_style = kUpperCamelCase;
+  uint32_t parameter_style = kUpperCamelCase | kAllCaps;
+  std::unique_ptr<re2::RE2> localparam_style_regex =
+      std::make_unique<re2::RE2>(kLocalparamDefaultRegex, re2::RE2::Quiet);
+  std::unique_ptr<re2::RE2> parameter_style_regex =
+      std::make_unique<re2::RE2>(kParameterDefaultRegex, re2::RE2::Quiet);
+
   using verible::config::SetNamedBits;
-  return verible::ParseNameValues(
+  using verible::config::SetRegex;
+
+  absl::Status s = verible::ParseNameValues(
       configuration,
-      {{"localparam_style", SetNamedBits(&localparam_allowed_style_, choices)},
-       {"parameter_style", SetNamedBits(&parameter_allowed_style_, choices)}});
+      {{"localparam_style", SetNamedBits(&localparam_style, choices)},
+       {"parameter_style", SetNamedBits(&parameter_style, choices)},
+       {"localparam_style_regex", SetRegex(&localparam_style_regex)},
+       {"parameter_style_regex", SetRegex(&parameter_style_regex)}});
+
+  if (!s.ok()) {
+    return s;
+  }
+
+  // Form a regex to use based on *_style, and *_style_regex
+  s = ConfigureRegex(&localparam_style_regex_, localparam_style,
+                     &localparam_style_regex);
+  if (!s.ok()) {
+    return s;
+  }
+
+  s = ConfigureRegex(&parameter_style_regex_, parameter_style,
+                     &parameter_style_regex);
+  return s;
 }
 
 LintRuleStatus ParameterNameStyleRule::Report() const {
diff --git a/verilog/analysis/checkers/parameter_name_style_rule.h b/verilog/analysis/checkers/parameter_name_style_rule.h
index 548dc2be3..4fe4be90c 100644
--- a/verilog/analysis/checkers/parameter_name_style_rule.h
+++ b/verilog/analysis/checkers/parameter_name_style_rule.h
@@ -16,6 +16,7 @@
 #define VERIBLE_VERILOG_ANALYSIS_CHECKERS_PARAMETER_NAME_STYLE_RULE_H_
 
 #include <cstdint>
+#include <memory>
 #include <set>
 #include <string>
 
@@ -25,42 +26,56 @@
 #include "common/analysis/syntax_tree_lint_rule.h"
 #include "common/text/symbol.h"
 #include "common/text/syntax_tree_context.h"
+#include "re2/re2.h"
 #include "verilog/analysis/descriptions.h"
 
 namespace verilog {
 namespace analysis {
 
 // ParameterNameStyleRule checks that each non-type parameter/localparam
-// follows the correct naming convention.
-// parameter should follow UpperCamelCase (preferred) or ALL_CAPS.
-// localparam should follow UpperCamelCase.
+// follows the correct naming convention matching a regex pattern.
 class ParameterNameStyleRule : public verible::SyntaxTreeLintRule {
  public:
   using rule_type = verible::SyntaxTreeLintRule;
 
+  ParameterNameStyleRule();
+
   static const LintRuleDescriptor &GetDescriptor();
 
-  absl::Status Configure(absl::string_view configuration) final;
+  std::string CreateLocalparamViolationMessage();
+  std::string CreateParameterViolationMessage();
 
   void HandleSymbol(const verible::Symbol &symbol,
                     const verible::SyntaxTreeContext &context) final;
 
   verible::LintRuleStatus Report() const final;
 
+  absl::Status Configure(absl::string_view configuration) final;
+
+  const RE2 *localparam_style_regex() const {
+    return localparam_style_regex_.get();
+  }
+  const RE2 *parameter_style_regex() const {
+    return parameter_style_regex_.get();
+  }
+
  private:
-  // Format diagnostic message.
-  static std::string ViolationMsg(absl::string_view symbol_type,
-                                  uint32_t allowed_bitmap);
+  absl::Status AppendRegex(std::unique_ptr<re2::RE2> *rule_regex,
+                           absl::string_view regex_str);
+  absl::Status ConfigureRegex(std::unique_ptr<re2::RE2> *rule_regex,
+                              uint32_t config_style,
+                              std::unique_ptr<re2::RE2> *config_style_regex);
 
   enum StyleChoicesBits {
     kUpperCamelCase = (1 << 0),
     kAllCaps = (1 << 1),
   };
 
-  uint32_t localparam_allowed_style_ = kUpperCamelCase;
-  uint32_t parameter_allowed_style_ = kUpperCamelCase | kAllCaps;
-
   std::set<verible::LintViolation> violations_;
+
+  // Regex's to check the style against
+  std::unique_ptr<re2::RE2> localparam_style_regex_;
+  std::unique_ptr<re2::RE2> parameter_style_regex_;
 };
 
 }  // namespace analysis
diff --git a/verilog/analysis/checkers/parameter_name_style_rule_test.cc b/verilog/analysis/checkers/parameter_name_style_rule_test.cc
index 1160ed231..248ae9984 100644
--- a/verilog/analysis/checkers/parameter_name_style_rule_test.cc
+++ b/verilog/analysis/checkers/parameter_name_style_rule_test.cc
@@ -15,7 +15,11 @@
 #include "verilog/analysis/checkers/parameter_name_style_rule.h"
 
 #include <initializer_list>
+#include <string>
 
+#include "absl/status/status.h"
+#include "absl/strings/str_cat.h"
+#include "absl/strings/string_view.h"
 #include "common/analysis/linter_test_utils.h"
 #include "common/analysis/syntax_tree_linter_test_utils.h"
 #include "gtest/gtest.h"
@@ -39,6 +43,7 @@ TEST(ParameterNameStyleRuleTest, AcceptTests) {
       {"module foo; localparam type Bar_1 = 1; endmodule"},
       {"module foo; localparam Bar = 1; endmodule"},
       {"module foo; localparam int Bar = 1; endmodule"},
+      {"module foo; localparam int P = 1; endmodule"},
       {"module foo; parameter int HelloWorld = 1; endmodule"},
       {"module foo #(parameter int HelloWorld_1 = 1); endmodule"},
       {"module foo #(parameter type Foo); endmodule"},
@@ -53,6 +58,7 @@ TEST(ParameterNameStyleRuleTest, AcceptTests) {
       {"parameter int Foo = 1;"},
       {"parameter type FooBar;"},
       {"parameter Foo = 1;"},
+      {"parameter P = 1;"},
 
       // Make sure parameter type triggers no violation
       {"module foo; localparam type Bar_Hello_1 = 1; endmodule"},
@@ -214,6 +220,186 @@ TEST(ParameterNameStyleRuleTest, ConfigurationFlavorCombinations) {
   }
 }
 
+TEST(ParameterNameStyleRuleTest, ConfigurationPass) {
+  ParameterNameStyleRule rule;
+  absl::Status status;
+
+  // Upper Camel Case (may end in _[0-9]+)
+  constexpr absl::string_view kUpperCamelCaseRegex =
+      "(([A-Z0-9]+[a-z0-9]*)+(_[0-9]+)?)";
+  // ALL_CAPS
+  constexpr absl::string_view kAllCapsRegex = "([A-Z_0-9]+)";
+
+  const std::string default_localparam_regex =
+      std::string(kUpperCamelCaseRegex);
+  const std::string default_parameter_regex =
+      absl::StrCat(kUpperCamelCaseRegex, "|", kAllCapsRegex);
+
+  // Default Config
+  EXPECT_TRUE((status = rule.Configure("")).ok()) << status.message();
+  EXPECT_EQ(rule.localparam_style_regex()->pattern(), default_localparam_regex);
+  EXPECT_EQ(rule.parameter_style_regex()->pattern(), default_parameter_regex);
+
+  // Set to ALL_CAPS using *_style
+  EXPECT_TRUE((status = rule.Configure("localparam_style:ALL_CAPS")).ok())
+      << status.message();
+  EXPECT_EQ(rule.localparam_style_regex()->pattern(), kAllCapsRegex);
+  EXPECT_EQ(rule.parameter_style_regex()->pattern(), default_parameter_regex);
+
+  EXPECT_TRUE((status = rule.Configure("parameter_style:ALL_CAPS")).ok())
+      << status.message();
+  EXPECT_EQ(rule.localparam_style_regex()->pattern(), default_localparam_regex);
+  EXPECT_EQ(rule.parameter_style_regex()->pattern(), kAllCapsRegex);
+
+  // Set to CamelCase using *_style
+  EXPECT_TRUE((status = rule.Configure("localparam_style:CamelCase")).ok())
+      << status.message();
+  EXPECT_EQ(rule.localparam_style_regex()->pattern(), kUpperCamelCaseRegex);
+  EXPECT_EQ(rule.parameter_style_regex()->pattern(), default_parameter_regex);
+
+  EXPECT_TRUE((status = rule.Configure("parameter_style:CamelCase")).ok())
+      << status.message();
+  EXPECT_EQ(rule.localparam_style_regex()->pattern(), default_localparam_regex);
+  EXPECT_EQ(rule.parameter_style_regex()->pattern(), kUpperCamelCaseRegex);
+
+  // Set to ALL_CAPS | CamelCase using *_style
+  EXPECT_TRUE(
+      (status = rule.Configure("localparam_style:ALL_CAPS|CamelCase")).ok())
+      << status.message();
+  EXPECT_EQ(rule.localparam_style_regex()->pattern(),
+            absl::StrCat(kUpperCamelCaseRegex, "|", kAllCapsRegex));
+  EXPECT_EQ(rule.parameter_style_regex()->pattern(), default_parameter_regex);
+
+  EXPECT_TRUE(
+      (status = rule.Configure("parameter_style:ALL_CAPS|CamelCase")).ok())
+      << status.message();
+  EXPECT_EQ(rule.localparam_style_regex()->pattern(), default_localparam_regex);
+  EXPECT_EQ(rule.parameter_style_regex()->pattern(),
+            absl::StrCat(kUpperCamelCaseRegex, "|", kAllCapsRegex));
+
+  // Set *_style_regex without setting *_style, expect default configuration and
+  // regex
+  EXPECT_TRUE((status = rule.Configure("localparam_style_regex:[a-z_]+")).ok())
+      << status.message();
+  EXPECT_EQ(rule.localparam_style_regex()->pattern(),
+            absl::StrCat(default_localparam_regex, "|([a-z_]+)"));
+  EXPECT_EQ(rule.parameter_style_regex()->pattern(), default_parameter_regex);
+
+  EXPECT_TRUE((status = rule.Configure("parameter_style_regex:[a-z_]+")).ok())
+      << status.message();
+  EXPECT_EQ(rule.localparam_style_regex()->pattern(), default_localparam_regex);
+  EXPECT_EQ(rule.parameter_style_regex()->pattern(),
+            absl::StrCat(default_parameter_regex, "|([a-z_]+)"));
+
+  // Set using just a regex pattern
+  EXPECT_TRUE((status = rule.Configure(
+                   "localparam_style:;localparam_style_regex:[a-z_]+"))
+                  .ok())
+      << status.message();
+  EXPECT_EQ(rule.localparam_style_regex()->pattern(), "([a-z_]+)");
+  EXPECT_EQ(rule.parameter_style_regex()->pattern(), default_parameter_regex);
+
+  EXPECT_TRUE((status = rule.Configure(
+                   "parameter_style:;parameter_style_regex:[a-z_]+"))
+                  .ok())
+      << status.message();
+  EXPECT_EQ(rule.localparam_style_regex()->pattern(), default_localparam_regex);
+  EXPECT_EQ(rule.parameter_style_regex()->pattern(), "([a-z_]+)");
+
+  // Set ALL_CAPS and user regex
+  EXPECT_TRUE((status = rule.Configure(
+                   "localparam_style:ALL_CAPS;localparam_style_regex:[a-z_]+"))
+                  .ok())
+      << status.message();
+  EXPECT_EQ(rule.localparam_style_regex()->pattern(),
+            absl::StrCat(kAllCapsRegex, "|([a-z_]+)"));
+  EXPECT_EQ(rule.parameter_style_regex()->pattern(), default_parameter_regex);
+
+  EXPECT_TRUE((status = rule.Configure(
+                   "parameter_style:ALL_CAPS;parameter_style_regex:[a-z_]+"))
+                  .ok())
+      << status.message();
+  EXPECT_EQ(rule.localparam_style_regex()->pattern(), default_localparam_regex);
+  EXPECT_EQ(rule.parameter_style_regex()->pattern(),
+            absl::StrCat(kAllCapsRegex, "|([a-z_]+)"));
+
+  // Set CamelCase and user regex
+  EXPECT_TRUE((status = rule.Configure(
+                   "localparam_style:CamelCase;localparam_style_regex:[a-z_]+"))
+                  .ok())
+      << status.message();
+  EXPECT_EQ(rule.localparam_style_regex()->pattern(),
+            absl::StrCat(kUpperCamelCaseRegex, "|([a-z_]+)"));
+  EXPECT_EQ(rule.parameter_style_regex()->pattern(), default_parameter_regex);
+
+  EXPECT_TRUE((status = rule.Configure(
+                   "parameter_style:CamelCase;parameter_style_regex:[a-z_]+"))
+                  .ok())
+      << status.message();
+  EXPECT_EQ(rule.localparam_style_regex()->pattern(), default_localparam_regex);
+  EXPECT_EQ(rule.parameter_style_regex()->pattern(),
+            absl::StrCat(kUpperCamelCaseRegex, "|([a-z_]+)"));
+
+  // Set CamelCase|All_CAPS and set user regex (everything)
+  EXPECT_TRUE((status = rule.Configure("localparam_style:CamelCase|ALL_CAPS;"
+                                       "localparam_style_regex:[a-z_]+"))
+                  .ok())
+      << status.message();
+  EXPECT_EQ(
+      rule.localparam_style_regex()->pattern(),
+      absl::StrCat(kUpperCamelCaseRegex, "|", kAllCapsRegex, "|([a-z_]+)"));
+  EXPECT_EQ(rule.parameter_style_regex()->pattern(), default_parameter_regex);
+
+  EXPECT_TRUE(
+      (status = rule.Configure(
+           "parameter_style:CamelCase|ALL_CAPS;parameter_style_regex:[a-z_]+"))
+          .ok())
+      << status.message();
+  EXPECT_EQ(rule.localparam_style_regex()->pattern(), default_localparam_regex);
+  EXPECT_EQ(
+      rule.parameter_style_regex()->pattern(),
+      absl::StrCat(kUpperCamelCaseRegex, "|", kAllCapsRegex, "|([a-z_]+)"));
+
+  // Test *_style with regex and not setting *_style_regex. The rule should not
+  // violate any style
+  EXPECT_TRUE((status = rule.Configure("localparam_style:")).ok())
+      << status.message();
+  EXPECT_EQ(rule.localparam_style_regex()->pattern(), ".*");
+  EXPECT_EQ(rule.parameter_style_regex()->pattern(), default_parameter_regex);
+
+  EXPECT_TRUE((status = rule.Configure("parameter_style:")).ok())
+      << status.message();
+  EXPECT_EQ(rule.localparam_style_regex()->pattern(), default_localparam_regex);
+  EXPECT_EQ(rule.parameter_style_regex()->pattern(), ".*");
+
+  // test empty *style (empty string) and setting *_style_regex with empty
+  // string
+  EXPECT_TRUE(
+      (status = rule.Configure("localparam_style:;localparam_style_regex:"))
+          .ok())
+      << status.message();
+  EXPECT_EQ(rule.localparam_style_regex()->pattern(), ".*");
+  EXPECT_EQ(rule.parameter_style_regex()->pattern(), default_parameter_regex);
+
+  EXPECT_TRUE(
+      (status = rule.Configure("parameter_style:;parameter_style_regex:")).ok())
+      << status.message();
+  EXPECT_EQ(rule.localparam_style_regex()->pattern(), default_localparam_regex);
+  EXPECT_EQ(rule.parameter_style_regex()->pattern(), ".*");
+
+  // FIXME: test invalid regex
+  EXPECT_FALSE((status = rule.Configure("localparam_style_regex:[a-z")).ok())
+      << status.message();
+  EXPECT_FALSE((status = rule.Configure("parameter_style_regex:[a-z")).ok())
+      << status.message();
+
+  // FIXME: test invalid style
+  EXPECT_FALSE((status = rule.Configure("localparam_style:invalid_style")).ok())
+      << status.message();
+  EXPECT_FALSE((status = rule.Configure("parameter_style:invalid_style")).ok())
+      << status.message();
+}
+
 }  // namespace
 }  // namespace analysis
 }  // namespace verilog