PureBasic Forums - English

Posted: **Fri Sep 27, 2019 8:35 pm**

Hello,

I have th following code:

RegEx.s = "(?<=\d{1,3}\.\d{1,3}\.\d{1,3}\.\d{1,3})"
CreateRegularExpression(0, RegEx.s)
RegExResult.s = ReplaceRegularExpression(0, "192.178.168.51;PC;User", "---")
Debug RegExResult.s

Can't figure out why PB takes exception to this... isn't this pretty standard RegEx? This is my error msg:

Code: Select all

[ERROR] The specified #RegularExpression is not initialised.

I am running v5.62. Any ideas?

Thanks!

Posted: **Fri Sep 27, 2019 8:51 pm**

You can use:RegularExpressionError()

lookbehind assertion is not fixed length

Posted: **Fri Sep 27, 2019 8:57 pm**

Thanks! However, I am still clueless as to what the error message is supposed to mean...

Posted: **Fri Sep 27, 2019 9:11 pm**

If you use a lookbehind assertion, you can not use non-fixed length strings, like \d{1,3} or .+ or .*.
You have you search it as a group, for example:

Code: Select all

RegEx.s = "(\d{1,3}\.\d{1,3}\.\d{1,3}\.\d{1,3};).+"
CreateRegularExpression(0, RegEx.s)
If ExamineRegularExpression(0, "192.178.168.51;PC;User")
	While NextRegularExpressionMatch(0)
		RegExResult.s = RegularExpressionGroup(0, 1) + "---"
		Debug RegExResult
	Wend
EndIf

Posted: **Fri Sep 27, 2019 9:14 pm**

Excellent! Thank you for the explanation!

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