trim() function Java Script

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Use these function in Java Script body :
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function trim(stringToTrim) {
    return stringToTrim.replace(/^\s+|\s+$/g,"");
}

function TestTrimString(){
     var testString="  Hello!  "
    document.write("String before  triming:" + testString );  
    document.write("String after     triming:" + trim(testString) );
}

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