Capture results between delimiters. Content may contain a delimiter character

I have the following reg exp: /@\w+(\(((?:(?!\))\S|\s)*)\))?/m

And the value I’m expecting are template files like:

@for($i = 0; $i < 10; $i++)
    {{ $i }}
@endfor

@if(
    !empty($name)
    && $name == 'Carlos'
)
    Hi Carlos
@endif

@csfr

I’m having trouble capturing the full content from @if parenthesis.

The expected result would be:

!empty($name)
&& $name == 'Carlos'

But it returns this instead because of the closing parenthesis from the empty function:

!empty($name

How to capture the full expression, since this could contain calls to other functions?

Regexp debug link: https://regex101.com/r/58ZbXe/1

>Solution :

You can use

@\w+(\(((?:[^()]++|(\g<1>))*)\))?

See the regex demo.

Details:

• @ – a @ char
• \w+ – one or more word chars
• (\(((?:[^()]++|(\g<1>))*)\))? – Group 1 (optional):
  • \( – a ( char
  • ((?:[^()]++|(\g<1>))*) – Group 2:
    • (?:[^()]++|(\g<1>))* – zero or more repetitions of either one or more chars other than ( and ) or Group 1 pattern
  • \) – a ) char.