Groups in regular expressions don't repeat as expected
nagle at animats.com
Wed Apr 20 15:20:06 EDT 2011
Here's something that surprised me about Python regular expressions.
>>> krex = re.compile(r"^([a-z])+$")
>>> s = "abcdef"
>>> ms = krex.match(s)
The parentheses indicate a capturing group within the
regular expression, and the "+" indicates that the
group can appear one or more times. The regular
expression matches that way. But instead of returning
a captured group for each character, it returns only the
The documentation in fact says that, at
"If a group is contained in a part of the pattern that matched multiple
times, the last match is returned."
That's kind of lame, though. I'd expect that there would be some way
to retrieve all matches.
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