Re: Feature request: plain option for gsub
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- Subject: Re: Feature request: plain option for gsub
- From: Tom N Harris <telliamed@...>
- Date: 2014年8月22日 00:42:30 -0400
On Friday, August 22, 2014 12:17:09 AM Petite Abeille wrote:
> function replace( s, this, that ) return ( s:gsub( escape( this ), escape(
> that ) ) ) end
Or...
local p, q = s:find(this, 1, true)
if p then s = s:sub(1, p-1) .. that .. s:sub(q+1) end
Still just three function calls and avoids the pattern matching machine which
is the whole reason of having a plain option.
Although it is well established that a plain option to gsub is not strictly
necessary, I don't think I've heard a compelling reason not to have it.
Pro: Avoid the overhead of pattern matching. Will be backward-compatible.
Con: Adds to code maintenance. Can be trivially emulated. May only be modestly
faster than find/sub.
--
tom <telliamed@whoopdedo.org>