diff --git a/app/src/main/java/com/pilot51/voicenotify/Constants.kt b/app/src/main/java/com/pilot51/voicenotify/Constants.kt
new file mode 100644
index 0000000..7432e4d
--- /dev/null
+++ b/app/src/main/java/com/pilot51/voicenotify/Constants.kt
@@ -0,0 +1,5 @@
+package com.pilot51.voicenotify
+
+object Constants {
+    const val REGEX_PREFIX = "\$regex:"
+}
diff --git a/app/src/main/java/com/pilot51/voicenotify/NotificationInfo.kt b/app/src/main/java/com/pilot51/voicenotify/NotificationInfo.kt
index 9ccc5aa..a7dfe81 100644
--- a/app/src/main/java/com/pilot51/voicenotify/NotificationInfo.kt
+++ b/app/src/main/java/com/pilot51/voicenotify/NotificationInfo.kt
@@ -132,8 +132,13 @@ data class NotificationInfo(
 		val ttsTextReplace = if (isComposePreview) null else settings.ttsTextReplace
 		val textReplaceList = PreferencesViewModel.convertTextReplaceStringToList(ttsTextReplace)
 		for (pair in textReplaceList) {
-			ttsMessage = ttsMessage!!.replace(
-				"(?i)${Pattern.quote(pair.first)}".toRegex(), pair.second)
+			val pattern =
+				if (pair.first.startsWith(Constants.REGEX_PREFIX))
+					Regex(pair.first.removePrefix(Constants.REGEX_PREFIX))
+				else
+					"(?i)${Pattern.quote(pair.first)}".toRegex()
+
+			ttsMessage = ttsMessage!!.replace(pattern, pair.second)
 		}
 		val maxLength = if (isComposePreview) 0 else {
 			settings.ttsMaxLength ?: DEFAULT_MAX_LENGTH
diff --git a/app/src/main/java/com/pilot51/voicenotify/Service.kt b/app/src/main/java/com/pilot51/voicenotify/Service.kt
index 4c881c3..2c6f795 100644
--- a/app/src/main/java/com/pilot51/voicenotify/Service.kt
+++ b/app/src/main/java/com/pilot51/voicenotify/Service.kt
@@ -70,6 +70,7 @@ import kotlinx.coroutines.flow.first
 import kotlinx.coroutines.flow.firstOrNull
 import kotlinx.coroutines.launch
 import java.util.*
+import java.util.regex.PatternSyntaxException
 
 class Service : NotificationListenerService() {
 	private val appContext by ::applicationContext
@@ -222,16 +223,29 @@ class Service : NotificationListenerService() {
 				info.ignoreReasons.add(IgnoreReason.EMPTY_MSG)
 			}
 			if (ttsMsg != null) {
+				fun containsOrMatchesRegex(it: String): Boolean {
+					return if (it.startsWith(Constants.REGEX_PREFIX))
+						try {
+							val pattern = it.removePrefix(Constants.REGEX_PREFIX)
+							Regex(pattern, RegexOption.IGNORE_CASE)
+								.containsMatchIn(ttsMsg)
+						} catch (e: PatternSyntaxException) {
+							false
+						}
+					else
+						ttsMsg.contains(it, true)
+				}
+
 				val requireStrings = settings.requireStrings?.split("\n")
 				val stringRequired = requireStrings?.all {
-					it.isNotEmpty() && !ttsMsg.contains(it, true)
+					it.isNotEmpty() && !containsOrMatchesRegex(it)
 				} ?: false
 				if (stringRequired) {
 					info.ignoreReasons.add(IgnoreReason.STRING_REQUIRED)
 				}
 				val ignoreStrings = settings.ignoreStrings?.split("\n")
 				val stringIgnored = ignoreStrings?.any {
-					it.isNotEmpty() && ttsMsg.contains(it, true)
+					it.isNotEmpty() && containsOrMatchesRegex(it)
 				} ?: false
 				if (stringIgnored) {
 					info.ignoreReasons.add(IgnoreReason.STRING_IGNORED)