dsl: extend #/../ operator to be able to extract a matched group in the pattern #3768
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(#/..(...).../ string group)
returns nth GROUP of the patternmatch. If the STRING doesn't match to the pattern, "", an empty string
is returned.
(#/..(...).../ string group fallback)
does the same as(#/..(...).../ string group)
when matching. The expression returnsFALLBACK unless matching.
This extension is useful for generating C code with readtags.
An exapmle session: