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This function simple returns True or False on whether a regular expression pattern is valid. Please see below for more details. Thanks. Function ; #FUNCTION# ==================================================================================================================== ; Name ..........: _IsStringRegExp ; Description ...: Check whether or not a regular expression pattern is valid. ; Syntax ........: _IsStringRegExp($sExpression) ; Parameters ....: $sExpression - A regular expression pattern. ; Return values .: Success - True ; Failure - False ; Author ........: guinness ; Example .......: Yes ; =============================================================================================================================== Func _IsStringRegExp($sExpression) StringRegExp('', $sExpression, Default) Return @error <> 2 EndFunc ;==>_IsStringRegExpExample use of Function: #include <Constants.au3> Example() Func Example() MsgBox($MB_SYSTEMMODAL, '', '\Aabc(.* : ' & _IsStringRegExp('\Aabc(.*') & @CRLF) ; Returns False. MsgBox($MB_SYSTEMMODAL, '', '\Aabc(.*) : ' & _IsStringRegExp('\Aabc(.*)') & @CRLF) ; Returns True. MsgBox($MB_SYSTEMMODAL, '', '\\.** : ' & _IsStringRegExp('\\.**') & @CRLF) ; Returns False. MsgBox($MB_SYSTEMMODAL, '', '\\.* : ' & _IsStringRegExp('\\.*') & @CRLF); Returns True. EndFunc ;==>Example