Need help in Python regular expression

Mark Tolonen metolone+gmane at gmail.com
Fri Jun 12 06:41:24 CEST 2009


"meryl" <silverburgh.meryl at gmail.com> wrote in message 
news:2d4d8624-043b-4f5f-ae2d-bf73bca3d51b at p6g2000pre.googlegroups.com...
> Hi,
>
> I have this regular expression
> blockRE = re.compile(".*RenderBlock {\w+}")
>
> it works if my source is "RenderBlock {CENTER}".
>
> But I want it to work with
> 1. RenderTable {TABLE}
>
> So i change the regexp to re.compile(".*Render[Block|Table] {\w+}"),
> but that breaks everything
>
> 2. RenderBlock (CENTER)
>
> So I change the regexp to re.compile(".*RenderBlock {|\(\w+}|\)"),
> that also breaks everything
>
> Can you please tell me how to change my reg exp so that I can support
> all 3 cases:
> RenderTable {TABLE}
> RenderBlock (CENTER)
> RenderBlock {CENTER}

[abcd] syntax matches a single character from the set.  Use non-grouping 
parentheses instead:

-----------------------code----------------------
import re
pat = re.compile(r'Render(?:Block|Table) (?:\(\w+\)|{\w+})')

testdata = '''\
RenderTable {TABLE}
RenderBlock (CENTER)
RenderBlock {CENTER}
RenderTable {TABLE)      #shouldn't match
'''

print pat.findall(testdata)
---------------------------------------------------

Result:

['RenderTable {TABLE}', 'RenderBlock (CENTER)', 'RenderBlock {CENTER}']

-Mark





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