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From: Peter Otten <__peter__@web.de>
Newsgroups: comp.lang.python
Subject: Re: DSLs in perl and python (Was sobering observation)
Date: Fri, 18 Mar 2016 14:22:25 +0100
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Rustom Mody wrote:

> On Friday, March 18, 2016 at 4:17:06 AM UTC+5:30, MRAB wrote:
>> Stick an "x" on the end of the regex: /something/x or s/old/new/x.
> 
> Thanks!
> 
> Is there somewhere a regexp 'introspection' API/capability available?
> 
> ie if the re looks like
> rexp = r"""
> # DSL (instantiation) for describing NYSE symbology
> ^
> (?P<scrip>	     [A-Z]*)     # The base scrip
> (?P<serchar>	     [.+-])?     # Series type char
> (?P<series>	     [A-Z])?     # Series
> (?P<issuedc>	     [#])?       # issued char indicator
> $		     		 # Thats all (there should be!)
> """
> 
> I would like to know that the named-groups are
> {scrip, serchar, series, issued}
> without doing match/search etc

Is that a Perl or a Python question? If the latter:

>>> r = re.compile(rexp, re.VERBOSE)
>>> r.groupindex
{'serchar': 2, 'issuedc': 4, 'scrip': 1, 'series': 3}