Avoid Special Character using Javascript with Regular Expression

javascript validation for special charcter.

function checkSpecial(obj,objEvent)

{

var specialChar = "^[A-Za-z0-9_]+$" //regular expression defining a 5 digit number

var objVal = obj.value;

var objVallen = obj.value.length;

if (objVal != "")

{

if (objVal.search(specialChar) == -1) //if match failed

{

if (objEvent == "keyup") {

if (objVallen > 1) {

obj.value = objVal.substring(0, parseInt(objVallen) - 1);

}

else {

obj.value = "";

}

}

else {

obj.value = "";

}

alert("Invalid character");

obj.focus();

}

}

}

RegEx.Split vs. String.Split

String.split has some limitations in the split. but in the Regex.split will split duplicate delimeter.

The delimeter such as ||, ~~ and ::

string[] output  = null;  string inputSentence = "I am a developer|| I work on .Net || " +     "The latest framework available is 3.5";  //the following line will not work 

output = inputSentence .Split("||".ToCharArray());  

//use RegEx Split instead 

output =  System.Text.RegularExpressions.Regex.Split(inputSentence, System.Text.RegularExpressions.Regex.Escape("||"));