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Function: string llStringTrim( string src, integer type );

Returns a string that is src with leading and/or trailing white space (spaces, tabs, and line feeds) trimmed from it.

• string src
• integer type STRING_TRIM* flag(s)

Constant Description
STRING_TRIM_HEAD 0x1 Trims white space off the beginning.
STRING_TRIM_TAIL 0x2 Trims white space off the end.
STRING_TRIM 0x3 Trims white space off the beginning and end.


Whenever you are accepting unstructured input from a user -- whether via chat or via a notecard -- it is a good idea to always full trim it:

llStringTrim("User input", STRING_TRIM);

This example returns the number of leading and trailing 'white space' characters on a string that were removed (not particularly useful but shows how to use the function).

        llListen(4, "", llGetOwner(), "");

    on_rez(integer start_param)

    listen(integer channel, string name, key id, string message)
        //track the length
        integer length = llStringLength(message);
        //trim message (not necessary to store these to variables but makes reading easier)
        string trim_left  = llStringTrim(message, STRING_TRIM_HEAD);
        string trim_right = llStringTrim(message, STRING_TRIM_TAIL);
        string trim_both  = llStringTrim(message, STRING_TRIM);

        //output the results
        llOwnerSay("Initial length  = " + (string)length +
                 "\nLeading Spaces  = " + (string)(length - llStringLength(trim_left))+
                 "\nTrailing Spaces = " + (string)(length - llStringLength(trim_right))+
                 "\nTrimmed Message = \"" + trim_both + "\"");


  • The exact set of characters stripped are 0x09 (tab), line feed (0x0a, "\n"), vertical tab (0x0b), form feed (0x0c), carriage return (0x0d) and space (0x20, " ").
    • Only line feed and space function as true whitespace within SL, the others will produce some manner of a printable character.
    • The "\t" escape code doesn't actually represent the tab character, but several spaces instead.
    • Other whitespace characters defined in Unicode, such as non-breaking space (0xa0) or specific-width spaces in the 0x2000 range are not stripped.
  • Aside from white space at the beginning and / or end, the actual string will be unaffected. This means too, though, that extraneous spaces within the string -- for instance, a mistaken double-space type -- will not be corrected.
  • The following will remove all double spaces and leading and trailing spaces.
llDumpList2String(llParseString2List(src, [" "], []), " "); //works but can use a large quantity of memory
  • This method strips spaces from the sentence and may use less memory
//Added By To-mos Codewarrior
string str1 = "some words to remove the spaces from";
integer index;
while(~index=llSubStringIndex(str1," ")) {
  • The following will do the same:
(string)llParseString2List(src, [" "], []); //works but can use a large quantity of memory
  • llList2Json also trims strings contained in the list. Thus, an easy way to trim an entire list of strings is:
list l = ["  a  ", " b", "c ", " d "];
list trimmedList = llJson2List(llList2Json(JSON_ARRAY, l));
llReplaceSubString("some words to remove the spaces from", " ", "", 0);

Deep Notes


  • Introduced in 1.13.4
Date of release 25-04-2007

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function string llStringTrim( string src, integer type );