[ES|QL] Refactor promql validation

src/platform/packages/shared/kbn-esql-language/src/commands/registry/promql/utils.ts

@@ -686,7 +686,7 @@ export const PROMQL_REQUIRED_PARAMS = PROMQL_PARAMS.filter(({ required }) => req
 /* Matches "param=" or "param =" but not "endpoint=" for param "end". */
 const PARAM_ASSIGNMENT_PATTERNS = PROMQL_PARAM_NAMES.map((param) => ({
   param,
-  pattern: new RegExp(`\\b${param}\\s*=`, 'i'),
+  pattern: new RegExp(`${param}\\s*=`, 'i'),
 }));
 
 export function getPromqlParamDefinitions(): PromqlParamDefinition[] {

src/platform/packages/shared/kbn-esql-language/src/commands/registry/promql/validate.test.ts

@@ -83,4 +83,54 @@ describe('PROMQL Validation', () => {
       promqlExpectErrors('PROMQL step=5m start=?_tstart end=?_tend col0=(rate(x[5m]))', []);
     });
   });
+
+  describe('index validation', () => {
+    test('valid index', () => {
+      promqlExpectErrors(
+        'PROMQL index=timeseries_index step=5m start=?_tstart end=?_tend (rate(x[5m]))',
+        []
+      );
+    });
+
+    test('unknown index', () => {
+      promqlExpectErrors(
+        'PROMQL index=unknown_xyz step=5m start=?_tstart end=?_tend (rate(x[5m]))',
+        ['Unknown index "unknown_xyz"']
+      );
+    });
+
+    test('unknown index with missing query', () => {
+      promqlExpectErrors('PROMQL step="5m" index=hh', [
+        'Unknown index "hh"',
+        '[PROMQL] Missing query',
+      ]);
+    });
+
+    test('multiple indexes - all valid', () => {
+      promqlExpectErrors(
+        'PROMQL index=timeseries_index,time_series_index step=5m start=?_tstart end=?_tend (rate(x[5m]))',
+        []
+      );
+    });
+
+    test('multiple indexes - one invalid', () => {
+      promqlExpectErrors(
+        'PROMQL index=timeseries_index,unknown_xyz step=5m start=?_tstart end=?_tend (rate(x[5m]))',
+        ['Unknown index "unknown_xyz"']
+      );
+    });
+
+    test('wildcard index', () => {
+      promqlExpectErrors(
+        'PROMQL index=timeseries_* step=5m start=?_tstart end=?_tend (rate(x[5m]))',
+        []
+      );
+    });
+
+    test('invalid wildcard index', () => {
+      promqlExpectErrors('PROMQL index=unknown_* step=5m start=?_tstart end=?_tend (rate(x[5m]))', [
+        'Unknown index "unknown_*"',
+      ]);
+    });
+  });
 });