Question

I would like to match string like this with regEx:

@media only screen and (max-width: 479px){
.abv{style:value;style:value}
.xyz{style:value;style:value}

}

but somehow I cant.
My regEx start with / @media[^{]*\{ /gim
then a want to match everything except }} folow by }}
/@media[^{]*\{[^}}]*\}(?=})/gim -this is not working because [^}}] == [^}] … I have no idea how to make regEx working like this please help

Answer 1

You want this:

/@media[^{]*\{(?:(?!\}\s*\}).)*/gis

See it here on Regexr

1. You don’t need the m modifier, it works only on the anchors ^ and $

2. You meant the s modifier to make the . match also newline characters. You didn’t use the . in your regex, but I did.

3. What you want to achieve is possible with this construct (?:(?!\}\s*\}).)* it means match the next character only if it is not a } followed by another } with possibly whitespace in between. This assertion is ensured by the negative lookahead (?!\}\s*\}). The group starting with ?: is only a non capturing group, nothing special.