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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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