Javascript trim function

In programming, trim is a string manipulation function or algorithm. The most popular variants of the trim function strip only the beginning or end of the string. Typically named ltrim and rtrim respectively.

This Javascript code trim implementation removes all leading and trailing occurrences of a set of characters specified. If no characters are specified it will trim whitespace characters from the beginning or end or both of the string.

Without the second parameter, Javascript function will trim these characters:

* ” ” (ASCII 32 (0×20)), an ordinary space.
* “\t” (ASCII 9 (0×09)), a tab.
* “\n” (ASCII 10 (0×0A)), a new line (line feed).
* “\r” (ASCII 13 (0×0D)), a carriage return.
* “\0″ (ASCII 0 (0×00)), the NUL-byte.
* “\x0B” (ASCII 11 (0×0B)), a vertical tab.

function trim(str, chars) {
	return ltrim(rtrim(str, chars), chars);
}
 
function ltrim(str, chars) {
	chars = chars || "\\s";
	return str.replace(new RegExp("^[" + chars + "]+", "g"), "");
}
 
function rtrim(str, chars) {
	chars = chars || "\\s";
	return str.replace(new RegExp("[" + chars + "]+$", "g"), "");
}
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