Horacius ReX wrote:
>Hi,
>
>I have to read some data from a file, and on each block it always
>appears the followng string; xyz.vs.1-81_1 . It appears a lot of time
>with different numbers like;
>
>xyz.vs.1-81_1
>xyz.vs.1-1234_1
>xyz.vs.1-56431_1
>
>and so on
>
>My problem is that I need to extract from this string the number. For
>instance in xyz.vs.1-81_1 I have to extract the number 81, and in
>xyz.vs.1-1234_1 I need to get the number 1234.
>
>What is the easiest way of doing this ?
>
>Thanks
>
>
If the strings looks *allways* that way, so its not to complicated:
>>> number_regex = re.compile('-(\d+)_')
>>> print number_regex.search('xyz.vs.1-1234_1').group(1)
1234
>>> print number_regex.search('xyz.vs.1-56431_1').group(1)
56431
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