Replacing large number of substrings
Michael J. Fromberger
Michael.J.Fromberger at Clothing.Dartmouth.EDU
Mon Sep 5 00:17:00 CEST 2005
In article <431af96c$0$29438$da0feed9 at news.zen.co.uk>,
Will McGugan <news at NOwillmcguganSPAM.com> wrote:
> Is there a simple way of replacing a large number of substrings in a
> string? I was hoping that str.replace could take a dictionary and use it
> to replace the occurrences of the keys with the dict values, but that
> doesnt seem to be the case.
> To clarify, something along these lines..
> >>> dict_replace( "a b c", dict(a="x", b="y") )
> "x y c"
Perhaps the following solution might appeal to you:
. import re
. def replace_many(s, r):
. """Replace substrings of s. The parameter r is a dictionary in
. which each key is a substring of s to be replaced and the
. corresponding value is the string to replace it with.
. exp = re.compile('|'.join(re.escape(x) for x in r.keys()))
. return exp.sub(lambda m: r.get(m.group()), s)
Michael J. Fromberger | Lecturer, Dept. of Computer Science
http://www.dartmouth.edu/~sting/ | Dartmouth College, Hanover, NH, USA
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