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// @param st: The string that will be trimmed. @default whitespace
String.prototype.strim = function(st) {
st = st || "\\s";
return this.replace(new RegExp("^"+st+"+|"+st+"+$",'g'),'');
"alorem ipsuma".strim('a'); // return "lorem ipsum"
" lorem ipsum ".strim(); // return "lorem ipsum"
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