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- Subject: Re: Replacing substrings in a string
- From: Philippe Lhoste <PhiLho@...>
- Date: Sun, 04 Sep 2005 03:06:12 +0200
David Given wrote:
One thing I find myself needing to do suprisingly frequently is to replace all
occurances of a particular substring with a different substring, in a larger
Aha, you cry. string.gsub() is exactly what I'm looking for... except it's
not, because I can't turn off regular expression processing, and my pattern is
algorithmically generated and might contain '%' characters.
What's the best way around this? What I'd *like* is for a 'plain' parameter to
be added to string.gsub(), but of course that's unlikely to happen.
Although I believe it has been already asked...
I've been using a fairly naive approach --- repeatedly calling string.find,
constructing a list of fragments, and then concatenating them with
table.concat. It's a bit verbose and quite irritating, and I'm not convinced
about the speed. Are there any more cunning ways of doing this?
oldString = "Sale: 10% off, plus additional 5% off if 100% insured"
generatedPattern = "0%"
replace = "$"
pattern = string.gsub(generatedPattern, "%%", "%%%%")
newString = string.gsub(oldString, pattern, replace)
Seems to work, at least with this simplistic test...
-- (near) Paris -- France
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