Regex string doesn't match

Question

I'm having trouble matching a digit in a string with Python. While it should be clearly matched, It doesn't even match [0-9] [\d] or just 0 alone. Where is my oversight?

import re

file_without_extension = "/test/folder/something/file_0"

if re.match("[\d]+$", file_without_extension):
   print "file matched!"

Which part are you trying to match exactly? Are you trying to get the bits between the slashes? or just the filename at the end? Or literally just the number at the end? — rcbevans
– rcbevans, Commented May 15, 2013 at 15:26
Are you trying to check if a number is there, i.e use search, or extract the number from it, i.e re.findall? — rcbevans
– rcbevans, Commented May 15, 2013 at 15:30
Incidentally: always use raw strings for regexps (r"[\d]+$"). Otherwise you'll be back here with another mysterious problem in a few days. — alexis
– alexis, Commented May 15, 2013 at 18:06
How a bad naming could cost us time? Why not a direct "startWith"? — Daniel Bandeira
– Daniel Bandeira, Commented Apr 24, 2024 at 22:17

Explosion Pills · Accepted Answer · 2013-05-15 15:27:17Z

8

Read the documentation: http://docs.python.org/2/library/re.html#re.match

If zero or more characters at the beginning of string

You want to use re.search (or re.findall)

answered May 15, 2013 at 15:27

Explosion Pills

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1 Comment

F. Rakes Over a year ago

Thanks, I was only making sure the regex was right neglecting if I was even using the right function.

alexis · Accepted Answer · 2013-05-15 15:27:00Z

6

re.match is "anchored" to the beginning of the string. Use re.search.

answered May 15, 2013 at 15:27

alexis

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Comments

Ben · Accepted Answer · 2013-05-15 15:27:32Z

1

Use re.search instead of re.match.

answered May 15, 2013 at 15:27

Ben

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