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function ht_trim(str, charlist) {
// discuss at: http://phpjs.org/functions/trim/
// original by: Kevin van Zonneveld (http://kevin.vanzonneveld.net)
// improved by: mdsjack (http://www.mdsjack.bo.it)
// improved by: Alexander Ermolaev (http://snippets.dzone.com/user/AlexanderErmolaev)
// improved by: Kevin van Zonneveld (http://kevin.vanzonneveld.net)
// improved by: Steven Levithan (http://blog.stevenlevithan.com)
// improved by: Jack
// input by: Erkekjetter
// input by: DxGx
// bugfixed by: Onno Marsman
// example 1: trim(' Kevin van Zonneveld ');
// returns 1: 'Kevin van Zonneveld'
// example 2: trim('Hello World', 'Hdle');
// returns 2: 'o Wor'
// example 3: trim(16, 1);
// returns 3: 6
var whitespace, l = 0,
i = 0;
str += '';
if (!charlist) {
// default list
whitespace =
' \n\r\t\f\x0b\xa0\u2000\u2001\u2002\u2003\u2004\u2005\u2006\u2007\u2008\u2009\u200a\u200b\u2028\u2029\u3000';
} else {
// preg_quote custom list
charlist += '';
whitespace = charlist.replace(/([\[\]\(\)\.\?\/\*\{\}\+\$\^\:])/g, '$1');
}
l = str.length;
for (i = 0; i < l; i++) {
if (whitespace.indexOf(str.charAt(i)) === -1) {
str = str.substring(i);
break;
}
}
l = str.length;
for (i = l - 1; i >= 0; i--) {
if (whitespace.indexOf(str.charAt(i)) === -1) {
str = str.substring(0, i + 1);
break;
}
}
return whitespace.indexOf(str.charAt(0)) === -1 ? str : '';
}