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Extract substrings by matching patterns in the input string. This function can be used to extract specific information from a string.


string,... utf8.match ( string input, string pattern [, int index = 1 ] )

Required Arguments

  • input: A string character sequence
  • pattern: A string match pattern

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.

  • index: An integer representing the beginning position for the pattern matching


Returns a sequence of string matches from the input string, nil otherwise.


Click to collapse [-]

This example shows how to extract values from an input string by using a pattern to match the value parts.

local input = "Level: 5, Rank: General, 128.42 points"
local level, rank, points = utf8.match( input, "Level: (%d+), Rank: (.-), (%d+.?%d*) points" )
level, points = tonumber( level ), tonumber( points )

print( level, rank, points ) -- 5, General, 128.42

See Also