Can't get expected result with Python regex [closed]

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Closed 9 years ago.

开发者_C百科 Improve this question

I also tried [a-zA-Z]{2,}-\d+ but with the same results

def verify_commit_text(tags):
    for line in tags:
        if re.match('^NO-TIK',line):
            return True
        elif re.match('^NO-REVIEW', line):
            return True
        elif re.match('[a-zA-Z]-[0-9][0-9]', line):
            return True
        else:
            return False
if __name__ == '__main__':
    commit_text_verified = verify_commit_text(os.popen('hg tip --template "{desc}"'));
    #commit_text_verified = verify_commit_text(os.popen('hg log -r $1  --template "{desc}"'));
    if (commit_text_verified):
        sys.exit(0)
    else:
        print >> sys.stderr, ('[obey the rules!]')
        sys.exit(1);

if i use a text "JIRA-1234" the regex in :

 elif re.match('[a-zA-Z]-[0-9][0-9]', line):

does not seem to work and i get:

[obey the rules!]

on stdout.

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The regex is working exactly as you've specified it .. it is searching for 1 character and 1 digit. You probably want something like

re.match(r'[a-zA-Z]+-\d+\Z', line)

Further, always prefix regular expression strings with an 'r' as in the above. Or it will bite you.

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Since you want to match one or more letters and numbers, you need to use the + like this:

r'[a-zA-Z]+-\d+'

You can also specify a certain number of letters (for example) with {}:

r'[a-zA-Z]{2,}-\d{4}'

Here, {2,} means 2 or more, {4} means exactly 4, {,3} means 0-3, and {1,5} means 1-5 inclusive.