Odd behavior with per cent signs (forked from Re: Feature request: plain option for gsub)
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- Subject: 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 19:33:42 -0400
-- 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?)