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Date: Fri, 29 Mar 2013 10:41:26 +0000
Subject: Re: Doing both regex match and assignment within a If loop?
From: Arnaud Delobelle <arnodel@gmail.com>
To: Alain Ketterlin <alain@dpt-info.u-strasbg.fr>
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Xref: csiph.com comp.lang.python:42234

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On Friday, 29 March 2013, Alain Ketterlin wrote:

> Victor Hooi <victorhooi@gmail.com <javascript:;>> writes:
>
> >     expression1 = re.compile(r'....')
> >     expression2 = re.compile(r'....')
> [...]
>
> Just a quick remark: regular expressions are pretty powerful at
> representing alternatives. You could just stick everything inside a
> single re, as in '...|...'
>
>
Then use the returned match to check which alternative was recognized
> (make sure you have at least one group in each alternative).
>
>
Yes, and for extra ease/clarity you can name these alternatives (
'(?P<name>pattern)').  Then you can do

if m.group('case1'):
    ...
elif m.group('case2'):
   ...

-- 
Arnaud

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On Friday, 29 March 2013, Alain Ketterlin  wrote:<br><blockquote class=3D"g=
mail_quote" style=3D"margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-l=
eft:1ex">Victor Hooi &lt;<a href=3D"javascript:;" onclick=3D"_e(event, &#39=
;cvml&#39;, &#39;victorhooi@gmail.com&#39;)">victorhooi@gmail.com</a>&gt; w=
rites:<br>

<br>
&gt; =C2=A0 =C2=A0 expression1 =3D re.compile(r&#39;....&#39;)<br>
&gt; =C2=A0 =C2=A0 expression2 =3D re.compile(r&#39;....&#39;)<br>
[...]<br>
<br>
Just a quick remark: regular expressions are pretty powerful at<br>
representing alternatives. You could just stick everything inside a<br>
single re, as in &#39;...|...&#39;<br>=C2=A0<br></blockquote><blockquote cl=
ass=3D"gmail_quote" style=3D"margin:0 0 0 .8ex;border-left:1px #ccc solid;p=
adding-left:1ex">
Then use the returned match to check which alternative was recognized<br>
(make sure you have at least one group in each alternative).<br>
<br></blockquote><div><br></div><div>Yes, and for extra ease/clarity you ca=
n name these alternatives ( &#39;(?P&lt;name&gt;pattern<span></span>)&#39;)=
. =C2=A0Then you can do</div><div><br></div><div>if m.group(&#39;case1&#39;=
):</div>
<div>=C2=A0 =C2=A0 ...</div><div>elif m.group(&#39;case2&#39;):</div><div>=
=C2=A0 =C2=A0...</div><div><br></div><div>--=C2=A0</div><div>Arnaud</div><d=
iv><br></div>

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