list of regex special characters
I am looking for a list of special character in python regular expressions that need to be escaped if you want their literal meaning. I searched and can not find the list. Any help appreciated. -- http://mail.python.org/mailman/listinfo/python-list
Re: list of regex special characters
goldtech goldt...@worldpost.com writes: I am looking for a list of special character in python regular expressions that need to be escaped if you want their literal meaning. You can avoid caring about that by using ‘re.escape’, which escapes any characters in its input character that are not alphanumeric. I searched and can not find the list. Any help appreciated. import re help(re) … DESCRIPTION … The special characters are: … -- \ “I got some new underwear the other day. Well, new to me.” —Emo | `\ Philips | _o__) | Ben Finney -- http://mail.python.org/mailman/listinfo/python-list
Re: list of regex special characters
On 11/28/2010 05:58 PM, goldtech wrote: I am looking for a list of special character in python regular expressions that need to be escaped if you want their literal meaning. I searched and can not find the list. Any help appreciated. Trust the re module to tell you: import re chars = [chr(i) for i in range(0,256)] escaped = [c for c in chars if re.escape(c) != c] print len(escaped) 194 print escaped [...] can_use_unescaped = [c for c in chars if re.escape(c) == c] (adjust chars accordingly if you want to check unicode characters too). -tkc -- http://mail.python.org/mailman/listinfo/python-list
Re: list of regex special characters
Tim Chase python.l...@tim.thechases.com writes: On 11/28/2010 05:58 PM, goldtech wrote: I am looking for a list of special character in python regular expressions that need to be escaped if you want their literal meaning. Trust the re module to tell you: import re chars = [chr(i) for i in range(0,256)] escaped = [c for c in chars if re.escape(c) != c] Note that, according to its docstring, ‘re.escape’ doesn't distinguish characters that *need to be* escaped for their literal meaning; it simply escapes any non-alphanumeric character. can_use_unescaped = [c for c in chars if re.escape(c) == c] Right. There are three classes of character for this purpose: * those that have a literal meaning *only if* escaped * those that have literal meaning whether or not they are escaped * those that have a literal meaning *only if not* escaped The ‘re.escape’ function, according to its docstring, simply says any non-alphanumerics can safely be said to exist in one of the first two classes, and both are safe to escape without bothering to distinguish between them. The OP was asking for the first class specifically, but I question whether that's actually needed for the purpose. -- \ “The cost of education is trivial compared to the cost of | `\ ignorance.” —Thomas Jefferson | _o__) | Ben Finney -- http://mail.python.org/mailman/listinfo/python-list
