Added Syntax Highlighting for Regex

Author: Wicpar

src/main/kotlin/com/papsign/ktor/openapigen/annotations/type/string/pattern/RegularExpression.kt

@@ -6,4 +6,4 @@ import com.papsign.ktor.openapigen.validation.ValidatorAnnotation
 @Target(AnnotationTarget.TYPE, AnnotationTarget.PROPERTY)
 @SchemaProcessorAnnotation(RegularExpressionProcessor::class)
 @ValidatorAnnotation(RegularExpressionProcessor::class)
-annotation class RegularExpression(val pattern: String, val errorMessage: String = "")
+annotation class RegularExpression(@Language("RegExp") val pattern: String, val errorMessage: String = "")