Mega Code Archive
RegExp()
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Syntax
var variable = new RegExp(pattern, flags)
The RegExp() object represents a regular expression that is used for pattern matching.
The creation of the object takes pattern and flags parameters.
The pattern is a valid regular expression. The flags are either or both g (global) and i (ignore case).
Properties and Methods of the RegExp() Object
Property/MethodDescription
RegExp.$*Represents multiline
RegExp.$&Represents lastmatch
RegExp.$_Represents input
RegExp.$`Represents leftContext
RegExp.$'Represents rightContext
RegExp.$+Represents lastParen
RegExp.$1,$2,...$9Represents substring of matches
compile()Compiles a regular expression
exec()Executes the search for a match in a specified string
global_Specifies whether to check the expressions against all possible matches
ignoreCaseWhether case is ignored or not during a string search
inputString that is matched
lastIndex_Specifies the index at which to start matching the next string.
lastMatchLast matched characters
lastParenThe last parenthesized substring match
leftContextThe substring preceding the most recent match
multilineSpecifies whether to search on multiple lines
rightContextThe substring following the most recent match
sourceThe string pattern
test()Tests for a string match
<html>
<body>
<script language="JavaScript">
<!--
function isSSN(str){
// xxx-xx-xxxx
var regexp = /^(\d{9}|\d{3}-\d{2}-\d{4})$/;
return regexp.test(str);
}
function checkInput(){
var valid = true;
var ssn = document.form1.ssn.value;
if (!isSSN (ssn)){
window.alert("Invalid SSN: " + ssn);
valid = false;
}
else{
alert(ssn + " is a valid SSN");
}
}
-->
</script>
<form name="form1">
Enter your SSN:
<input type="text" size="15" name="ssn">
<br><br>
<input type="button" value="Validate SSN" onClick='checkInput()'>
<br>
</form>
</body>
</html>
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