Sublime Forum

**Yuval** · November 24, 2016, 10:53am

Refering to Sublime 3 syntax definition file:
Sometimes, while within a context you encounter a match that signals the end of this context. This match, however, might not belong to the current context, but to another context.
Is there a way not to “consume” a match? That is, if a context encounter this match it can act upon it (for example poping itself), but leave it on the input stream for another context to deal with?
Thanks

**kingkeith** · November 24, 2016, 11:17am

of course, just look a regex lookahead (?=match)

most famous example, HTML pushing into JavaScript and popping back to HTML at </script:

github.com

sublimehq/Packages/blob/dac2eb7173900cae5ca96661f5f96979cd1d6e5e/HTML/HTML.sublime-syntax#L106


        2: entity.name.tag.script.html
        3: punctuation.definition.tag.end.html
      pop: true
    - include: tag-stuff
    - match: '>'
      scope: punctuation.definition.tag.end.html
      push:
        - meta_content_scope: source.js.embedded.html
        - include: 'scope:source.js'
      with_prototype:
         - match: (?i)(?=</script)
           pop: true
- match: (</?)((?i:body|head|html)\b)
  captures:
    1: punctuation.definition.tag.begin.html
    2: entity.name.tag.structure.any.html
  push:
    - meta_scope: meta.tag.structure.any.html
    - match: '>'
      scope: punctuation.definition.tag.end.html
      pop: true

**Yuval** · November 27, 2016, 12:13pm

Thanks! I didn’t know about look-arounds, very useful.

Syntax context: matching without consuming?