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Returns a copy of the original input string with replaced matches from the pattern by the replacement value.


string utf8.gsub ( string input, string pattern, mixed replace [, int match_limit = utf8.len( input ) ] )

Required Arguments

  • input: A string character sequence
  • pattern: A string match pattern
  • replace: A string literal OR an integer value OR a function (see examples below) OR a table ({ match = replacement })

Optional Arguments

NOTE: When using optional arguments, you might need to supply all arguments before the one you wish to use. For more information on optional arguments, see optional arguments.

  • match_limit: An integer to limit the number of substitutions made


Returns a pair of values, the modified string and the integer number of substitutions made.


Click to collapse [-]

This example shows how to remove color codes from a string and how to uppercase each single character in a string.

local text= "#ff0000This text is red"
local colorless = utf8.gsub( text, "#%x%x%x%x%x%x", "" )
print( colorless ) -- This text is red

print( utf8.gsub( "Nice wiki!", ".", utf8.upper ) ) -- NICE WIKI!
Click to collapse [-]

This example uses a table to replace specific words in the input string by an other value.

local input = "We have nice weather in London"

local replacements = {
    ["weather"] = "food",
    ["London"] = "Germany"

local output = utf8.gsub( input, "%w+", replacements )
print( output ) -- We have nice food in Germany
Click to collapse [-]

This example shows a simple bad word filter, which censors the word 'ugly' in the input string.

local input = "You are ugly!"

local badwords = {
    ["ugly"] = true

local output = utf8.gsub( input, "%w+",
    function (match)
        local lowerCase = utf8.lower( match )
        if badwords[ lowerCase ] then
            return string.rep( '*', utf8.len( match ) )
        return match

outputConsole( output ) -- You are ****!

See Also