Documentation for this module may be created at Module:String/doc

return {
    sub = (function (frame)
        local args, pargs = frame.args, frame:getParent().args
        return mw.ustring.sub( args[1] or pargs[1] or "", tonumber( args[2] or pargs[2] ), tonumber( args[3] or pargs[3] ) )
    end),
    length = (function (frame)
        local args, pargs = frame.args, frame:getParent().args
        return mw.ustring.len( args[1] or pargs[1] or "" )
    end),
    find = (function (frame)
        local args, pargs = frame.args, frame:getParent().args
        local start = tonumber( args[3] or pargs[3] )
        local res = mw.ustring.find( args[1] or pargs[1] or "", args[2] or pargs[2] or "", start or 1, true  )
        
        start = res and (start and 4 or 3) or (start and 5 or 4)
        res = res or ""
        return args[start] or pargs[start] or res
    end),
    replace = (function (frame)
        local args, pargs = frame.args, frame:getParent().args
        local res = mw.ustring.gsub(
            args[1] or pargs[1] or "",
            mw.ustring.gsub( args[2] or pargs[2] or "", "([][^$%%.*+-?])", "%%%1" ),
            args[3] or pargs[3] or "",
            tonumber( args[4] or pargs[4] )
        )
        return res
    end),
    trim = (function (frame)
        local args, pargs = frame.args, frame:getParent().args
        local what = mw.ustring.gsub( args[2] or pargs[2] or "", "([][^$%%.*+-?()])", "%%%1" )
        local res = mw.ustring.gsub(
            mw.ustring.gsub( args[1] or pargs[1] or "", "^[" .. what .. "]*", "" ),
            "[" .. what .. "]*$",
            ""
        )
        return res
    end),
}
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