make regex more similar to TL

Author: lsoares

lib/src/main/kotlin/com/luissoares/ByPlaceholderText.kt

@@ -23,9 +23,10 @@ data class ByPlaceholderText(
                 }
             }
         } ?: regexText?.let {
+            val regexContains = Regex(".*${regexText.pattern}.*", regexText.options)
             getWebDriver(context).filterAll { element ->
                 element.getAttribute("placeholder")
-                    ?.let(regexText::matches)
+                    ?.let(regexContains::matches)
                     ?: false
             }
         }

lib/src/test/kotlin/com/luissoares/ByPlaceholderTextTest.kt

@@ -53,7 +53,7 @@ class ByPlaceholderTextTest {
         driver.getFromHtml("<input placeholder='Username' />")
 
         val result = driver.findElement(
-            ByPlaceholderText(regexText = Regex(".*user.*", IGNORE_CASE))
+            ByPlaceholderText(regexText = Regex("user", IGNORE_CASE))
         )
 
         assertEquals("input", result.tagName)