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[CLOSED] (?!) not suported (negative lookahead regex operator) #8783

Open core-ai-bot opened 3 years ago

core-ai-bot commented 3 years ago

Issue by jmichae3 Saturday Nov 08, 2014 at 15:51 GMT Originally opened as https://github.com/adobe/brackets/issues/9878

was doing (?!(.?)) or [a-zA-Z0-9 \t]+(?!:(.?)) which searches for lines of text which do not contain perens with text in them. the (?!) operator is what I am concerned about the lack of. along with it goes (?=) , (?<=), (?<!) for reference, see p.66 of o'reilly's Mastering Regular Expressions.

core-ai-bot commented 3 years ago

Comment by redmunds Saturday Nov 08, 2014 at 17:28 GMT

Brackets uses Chrome v8 JavaScript RegExp engine. I usually use this reference: https://developer.mozilla.org/en-US/docs/Web/JavaScript/Guide/Regular_Expressions

I'm not sure how to achieve what you want, but parens are a RegExp operator, so you'll need to escape the parens you want to match (i.e. \( and \)).

For example, ^.*\((?!\)).*$ matches any line that does have parens that are non-empty, but I'm not sure how to negate that.

core-ai-bot commented 3 years ago

Comment by peterflynn Friday Nov 21, 2014 at 19:44 GMT

Closing -- as designed. Brackets uses JS regular expressions for Find operations.

core-ai-bot commented 3 years ago

Comment by peterflynn Friday Nov 21, 2014 at 19:45 GMT

Here's a thread with more info on alternatives: http://stackoverflow.com/questions/6851921/negative-lookahead-regular-expression