[TEST] Extract language feature regex pattern to :test-infrastructure-utils

compiler/test-infrastructure-utils/tests/org/jetbrains/kotlin/test/util/Patterns.kt

@@ -0,0 +1,10 @@
+/*
+ * Copyright 2010-2020 JetBrains s.r.o. and Kotlin Programming Language contributors.
+ * Use of this source code is governed by the Apache 2.0 license that can be found in the license/LICENSE.txt file.
+ */
+
+package org.jetbrains.kotlin.test.util
+
+import java.util.regex.Pattern
+
+val LANGUAGE_FEATURE_PATTERN: Pattern = Pattern.compile("""(\+|-|warn:)(\w+)\s*""")

compiler/test-infrastructure/tests/org/jetbrains/kotlin/test/builders/LanguageVersionSettingsBuilder.kt

@@ -10,14 +10,12 @@ import org.jetbrains.kotlin.test.directives.LanguageSettingsDirectives
 import org.jetbrains.kotlin.test.directives.model.RegisteredDirectives
 import org.jetbrains.kotlin.test.directives.model.singleOrZeroValue
 import org.jetbrains.kotlin.test.services.DefaultsDsl
+import org.jetbrains.kotlin.test.util.LANGUAGE_FEATURE_PATTERN
 import org.jetbrains.kotlin.utils.addToStdlib.runIf
-import java.util.regex.Pattern
 
 @DefaultsDsl
 class LanguageVersionSettingsBuilder {
     companion object {
-        private val languageFeaturePattern = Pattern.compile("""(\+|-|warn:)(\w+)\s*""")
-
         fun fromExistingSettings(builder: LanguageVersionSettingsBuilder): LanguageVersionSettingsBuilder {
             return LanguageVersionSettingsBuilder().apply {
                 languageVersion = builder.languageVersion
@@ -79,7 +77,7 @@ class LanguageVersionSettingsBuilder {
     }
 
     private fun parseLanguageFeature(featureString: String) {
-        val matcher = languageFeaturePattern.matcher(featureString)
+        val matcher = LANGUAGE_FEATURE_PATTERN.matcher(featureString)
         if (!matcher.find()) {
             error(
                 """Wrong syntax in the '// !${LanguageSettingsDirectives.LANGUAGE.name}: ...' directive:

compiler/tests-common/tests/org/jetbrains/kotlin/checkers/CompilerTestLanguageVersionSettings.kt

@@ -9,9 +9,9 @@ import org.jetbrains.kotlin.cli.jvm.compiler.KotlinCoreEnvironment
 import org.jetbrains.kotlin.config.*
 import org.jetbrains.kotlin.test.Directives
 import org.jetbrains.kotlin.test.KotlinTestUtils
+import org.jetbrains.kotlin.test.util.LANGUAGE_FEATURE_PATTERN
 import org.junit.Assert
 import java.io.File
-import java.util.regex.Pattern
 
 const val LANGUAGE_DIRECTIVE = "LANGUAGE"
 const val API_VERSION_DIRECTIVE = "API_VERSION"
@@ -117,10 +117,8 @@ fun setupLanguageVersionSettingsForCompilerTests(originalFileText: String, envir
 private fun <T : Any> analysisFlag(flag: AnalysisFlag<T>, value: @kotlin.internal.NoInfer T?): Pair<AnalysisFlag<T>, T>? =
     value?.let(flag::to)
 
-private val languagePattern = Pattern.compile("(\\+|\\-|warn:)(\\w+)\\s*")
-
 private fun collectLanguageFeatureMap(directives: String): Map<LanguageFeature, LanguageFeature.State> {
-    val matcher = languagePattern.matcher(directives)
+    val matcher = LANGUAGE_FEATURE_PATTERN.matcher(directives)
     if (!matcher.find()) {
         Assert.fail(
                 "Wrong syntax in the '// !$LANGUAGE_DIRECTIVE: ...' directive:\n" +