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regexp: using (?P<name>re) isn't supported as such #2440

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mark-summerfield opened this issue Nov 10, 2011 · 8 comments
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regexp: using (?P<name>re) isn't supported as such #2440

mark-summerfield opened this issue Nov 10, 2011 · 8 comments
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@mark-summerfield
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Since none of the regexp functions return a "match object", but rather a slice
or slice of slices of actual matches, using a named capture group doesn't actually buy
you anything.

One easy solution is to just mention in the docs that named captures aren't supported.

Another solution might be to have a FindAllStringNamedMatch() function or similar.

And another would be to return some kind of "match object" (like Python does
with match.group() etc).

(I have no preferences/views, merely noting the fact + some ideas.)
@rsc
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rsc commented Nov 11, 2011

Comment 1:

Owner changed to @rsc.

Status changed to Accepted.

@rsc
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rsc commented Dec 9, 2011

Comment 2:

Labels changed: added priority-later, removed priority-medium.

@rsc
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rsc commented Dec 12, 2011

Comment 3:

Labels changed: added priority-go1.

@robpike
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robpike commented Jan 13, 2012

Comment 4:

Owner changed to builder@golang.org.

@dsymonds
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Comment 5:

Owner changed to @rsc.

Status changed to Started.

@rsc
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rsc commented Jan 19, 2012

Comment 6:

This issue was closed by revision 21d3721.

Status changed to Fixed.

@mark-summerfield
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Comment 7:

I can't see that the new regexp.SubexpNames() method buys much (but perhaps that's my
mistake).
ISTM that what's needed are something like:
regexp.Capture(int) (string, error)
regexp.CaptureOf(string) (string, error)
which return the index-th or named capture's matching text and nil or an empty string
and an error (either no such index/name, or no such match).

@rsc
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rsc commented Jan 20, 2012

Comment 8:

I'm treating that functionality as part of 2736.

@rsc rsc added this to the Go1 milestone Apr 10, 2015
@rsc rsc removed the priority-go1 label Apr 10, 2015
@golang golang locked and limited conversation to collaborators Jun 24, 2016
@rsc rsc removed their assignment Jun 22, 2022
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@dsymonds @rsc @mark-summerfield @robpike @gopherbot