Difference between revisions of "String.gmatch"

Latest revision as of 12:57, 9 October 2010

string.gmatch (s, pattern)

Returns an iterator function that, each time it is called, returns the next captures from pattern over string s. If pattern specifies no captures, then the whole match is produced in each call.

As an example, the following loop

    s = "hello world from Lua"
    for w in string.gmatch(s, "%a+") do
      print(w)
    end

will iterate over all the words from string s, printing one per line. The next example collects all pairs key=value from the given string into a table:

    t = {}
    s = "from=world, to=Lua"
    for k, v in string.gmatch(s, "(%w+)=(%w+)") do
      t[k] = v
    end

For this function, a '^' at the start of a pattern does not work as an anchor, as this would prevent the iteration.

String.find

String.match

String.sub

Lua Manual - String Patterns