[issue22949] fnmatch.translate doesn't add ^ at the beginning

[mstol]

New submission from mstol:

I'm not sure if this is real bug, but the documentation of fnmatch.translate 
states:

fnmatch.translate(pattern)

Return the shell-style pattern converted to a regular expression.



My intuition about shell-style pattern is that for example, pattern:t3
should match only t3, and not ost3 or xt3, but what I receive from fnmatch 
is:
In [2]: fnmatch.translate("t3")
Out[2]: 't3\\Z(?ms)'

so using for example re.search will match not only on t3, but also on xxxt3 (in 
shell-like pattern is *t3). So... I  believe it should be changed or at least 
the documentation should be more specific about what "shell-style pattern" mean.

--
components: Regular Expressions
messages: 231712
nosy: ezio.melotti, mrabarnett, mstol
priority: normal
severity: normal
status: open
title: fnmatch.translate doesn't add ^ at the beginning
type: behavior
versions: Python 2.7

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[issue22949] fnmatch.translate doesn't add ^ at the beginning

[mstol]

mstol added the comment:

it can be changed easyly with changing the return statement in 
fnmatch.py function translate 

from:
return res + '\Z(?ms)'

to:
return '^' + res + '\Z(?ms)'

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[issue22949] fnmatch.translate doesn't add ^ at the beginning

[mstol]

mstol added the comment:

So you suggest that this output should not be used with re.search ? Why?

I think it should be documented, or maybe it is?

I know that this is not possible to introduce such a change to the currently 
used versions.

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