Re: pattern matching problem
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- Subject: Re: pattern matching problem
- From: Philipp Janda <siffiejoe@...>
- Date: 2013年8月30日 22:31:17 +0200
Am 30.08.2013 22:14 schröbte Geoff Smith:
Hi
Hi!
I always seem to have difficulty with pattern matching in Lua, here is another example that has stumped me so far
I am trying to trim a number string to remove non significant trailing zeros. So for example
"123.450000000" = "123.45"
"1234500" = "1234500"
"12345.00" = "12345.0"
I could of course write a function that iterates through the string from the back dropping zeros, but I thought there is probably a more elegant solution using Lua pattern matching functions.
Can this be done neatly with pattern matching ? Thanks for any suggested code snippets
local function trim0( s )
return (string.gsub( s, "^(%d+%.%d?%d-)0*$", "%1" ))
end
print( trim0 "123.450000000" )
print( trim0 "1234500" )
print( trim0 "12345.0" )
Regards Geoff
Philipp