RegExp ?= Quantifier, matches any string that is followed by a specific string n. - Javascript RegExp

Javascript examples for RegExp:Quantifier

  1. HOME
  2. Javascript
  3. RegExp
  4. Quantifier

Description

The ?=n quantifier matches any string that is followed by a specific string n.

Use the ?!n quantifier to match any string that is NOT followed by a specific string n.

The following code shows how to Do a global search for "is" followed by " all":

Demo Code

ResultView the demo in separate window 

<!DOCTYPE html>
<html>
<body>

<button onclick="myFunction()">Test</button>

<p id="demo"></p>

<script>
function myFunction() {//  w  ww. ja v a2s . c  o  m
    var str = "Is this all there is The following code shows how to ";
    var patt1 = /is(?= all)/;
    var result = str.match(patt1);
    document.getElementById("demo").innerHTML = result;
}
</script>

</body>
</html>

Related Tutorials