How do I escape a string as a regular expression?

[riku22]

Hello.

How do I escape a string as a regular expression?
For example, converting "\d+" to "\\d\+".
In languages like Python, there are dedicated functions, how do I do that in PureBasic?
Any suggestions on how to do this would be appreciated.

Sincerely.

[Demivec]

You question is a little vague, at least to me.

Perhaps this: https://www.purebasic.com/documentation/string/escapestring.html

[riku22]

Hello.

I apologize for the vagueness of my question.
I also found "EscapeString", but it can't escape a string used as a regular expression pattern.
For example, if you want to specify the string "\d+" itself as a regular expression pattern, you need to escape it as "\\d\+".

[Marc56us]

How do I escape a string as a regular expression?
For example, converting "\d+" to "\\d\+".
In languages like Python, there are dedicated functions, how do I do that in PureBasic?

Hello,

Prefix string with au tilde (~) tells PB to handle escape characters.

Code: Select all

RegEx$ = ~"\\d+"		;  not "\\d\+""
Debug RegEx$			;  show \d+
; With RegEx
CreateRegularExpression(0, ~"\\d+") 

PS. You can use it even outside regular expressions

Code: Select all

A$ = ~"\"Hello World\"" 
Debug A$				; show "Hello World"

It's easier than using #DQUOTE$ or concatenating chains (ie: Chr(34)) and it's Win/Linux/Mac compatible.

[riku22]

Hello.

Sorry, that's not what I want to implement.
I want to perform a function similar to Python's re.escape function or PHP's preg_quote function.

[AZJIO]

find: [][{}()*+?.\\^$|=<>#]
replace: \\$0

\Q my_regexp \E

https://www.purebasic.fr/english/viewtopic.php?t=78070

[riku22]

Hello.

Thank you very much.
I was able to achieve what I wanted to do.

Sincerely.