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JavaScript RegExp ?= Quantifier
JavaSript RegExp Object
Definition and Usage
The ?=n quantifier matches any string that is followed by a specific string n.
Syntax
new RegExp("regexp(?=n)")
or
/regexp(?=n)/
or
/regexp(?=n)/
Browser Support
The ?= quantifier is supported in all major browsers.
Example
Example
Do a global search for "is" followed by " all":
var str="Is this all there is";
var patt1=/is(?= all)/g;
var patt1=/is(?= all)/g;
The marked text below shows where the expression gets a match:
Is this all there is
Try it yourself »
JavaSript RegExp Object
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Copyright 1999-2012 by Refsnes Data. All Rights Reserved.
Tutorials, references, and examples are constantly reviewed to avoid errors, but we cannot warrant full correctness of all content.
While using this site, you agree to have read and accepted our terms of use and privacy policy.
Copyright 1999-2012 by Refsnes Data. All Rights Reserved.