Regular Expression : Bad Character Range

Frank Cui ycui at
Fri Dec 20 03:53:04 CET 2013

should have escaped hyphen as it could be used for ranging. 

sorry for the bother...

From: ycui at
To: python-list at
Subject: Regular Expression : Bad Character Range
Date: Thu, 19 Dec 2013 23:50:52 -0300

Hey guys,

I'm trying to compile a regular Expression while encountering the following issue, any hints ?

is hyphen "-" or underscore "_" considered any meta character which is not allowed when putting into the range ?


In [2]: re.compile("[\w-_]+>")
error                                     Traceback (most recent call last)
/home/frank/<ipython-input-2-ee4b44c4d17a> in <module>()
----> 1 re.compile("[\w-_]+>")

/usr/lib/python2.7/re.pyc in compile(pattern, flags)
    188 def compile(pattern, flags=0):
    189     "Compile a regular expression pattern, returning a pattern object."
--> 190     return _compile(pattern, flags)
    192 def purge():

/usr/lib/python2.7/re.pyc in _compile(*key)
    240         p = sre_compile.compile(pattern, flags)
    241     except error, v:
--> 242         raise error, v # invalid expression
    243     if len(_cache) >= _MAXCACHE:
    244         _cache.clear()

error: bad character range


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