catch regex exception (#4)

build.gradle

@@ -5,7 +5,7 @@ plugins {
 }
 
 group 'dmitriy.molchanov'
-version '1.4'
+version '1.4.1'
 
 repositories {
     mavenCentral()
@@ -27,6 +27,10 @@ intellij {
 }
 patchPluginXml {
     changeNotes """
+        <b>1.4.1</b><br>
+        <ul>
+            <li>Regex bugfix.</li>
+        </ul>
         <b>1.4</b><br>
         <ul>
             <li>Added the ability to add additional text around the result regex value.</li>

src/main/kotlin/dmitriy/molchanov/ui/add/AddRuleDialog.kt

@@ -162,9 +162,9 @@ class AddRuleDialog(
                 shouldOkButtonActive = false
             ) to null
         }
-        val regex = Regex(prefixEdit.text)
+        val regex = prefixEdit.text.getRegexOrNull()
         val checkStr = checkStringEdit.text
-        regex.find(checkStr)?.range?.apply {
+        regex?.find(checkStr)?.range?.apply {
             val lastMatch = if (last == checkStr.length) last else last + 1
             val startText = checkStr.substring(0, first)
             val matchText = checkStr.substring(first, lastMatch)
@@ -187,7 +187,7 @@ class AddRuleDialog(
     private fun String.formatByParams(): String {
         val prefix = startWithEdit.text
         val suffix = endWithEdit.text
-        val registeredValue = when(shouldRuleBuUpperCase()){
+        val registeredValue = when (shouldRuleBuUpperCase()) {
             true -> uppercase()
             false -> lowercase()
             else -> this
@@ -213,6 +213,13 @@ class AddRuleDialog(
         else -> Strings.REGISTER_NONE
     }
 
+    private fun String.getRegexOrNull(): Regex? =
+        try {
+            Regex(this)
+        } catch (throwable: Throwable) {
+            null
+        }
+
     private class DialogStatus(val message: String, val shouldOkButtonActive: Boolean)
 
     private companion object {