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)/
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Example
Example
Do a global search for "is" followed by " all":
var str="Is this all there is";
var patt1=/is(?= all)/g;
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The marked text below shows where the expression gets a match:
Try it yourself »
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JavaSript RegExp Object
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