Re: Odd behavior with per cent signs (forked from Re: Feature request: plain option for gsub)
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- Subject: Re: Odd behavior with per cent signs (forked from Re: Feature request: plain option for gsub)
- From: Sean Conner <sean@...>
- Date: 2014年8月21日 19:35:41 -0400
It was thus said that the Great Sean Conner once stated:
> -- My version
>
> lpeg = require "lpeg"
>
> function spcreplace(s,this,that)
> local trans = lpeg.Cs(((lpeg.P(this) / that) + lpeg.P(1))^0)
> return trans:match(s)
> end
>
> print(spcreplace("100%% efficiency with 20%% effort","%%"," per cent"))
> print(spcreplace("100% efficiency with 20% effort","%"," per cent"))
> print(spcreplace("a target is here","target","%%"))
> print(spcreplace("a target is here","target","%"))
>
> -- Petite Abeille's version
>
> function escape( s ) return ( s:gsub( '%p', '%%%1' ) ) end
> function pareplace( s, this, that )
> return ( s:gsub( escape( this ), escape(that) ) )
> end
>
> print(pareplace("100%% efficiency with 20%% effort","%%"," per cent"))
> print(pareplace("100% efficiency with 20% effort","%"," per cent"))
> print(pareplace("a target is here","target","%%"))
> print(pareplace("a target is here","target","%"))
>
>
> Output:
>
> 100 per cent efficiency with 20 per cent effort
> 100 per cent efficiency with 20 per cent effort
> a % is here
> a
> 100 per cent efficiency with 20 per cent effort
> 100 per cent efficiency with 20 per cent effort
> a %% is here
> a % is here
>
> -spc (Am I missing something?)
>
Oops--forgot to mention---this is Lua 5.1.
-spc (I'm not set up to test Lua 5.2)