JavaScript RegExp ?! Modifier
 Complete RegExp Object Reference
Definition and Usage
When the ?! modifier is set the regular expression gets a match if the string
to search for is not followed by a specific string.
Syntax
new RegExp("regexp(?!ahead)")
OR
/regexp(?!ahead)/
|
| Parameter |
Description |
| regexp |
Required. The rest of the regular expression to use |
| ahead |
What the string must not be followed by to get a match |
Example
In the following code we will do a case insensitive global search for "is" if it is
not followed by " all":
var str = "Is this all there is";
var patt1 = new RegExp("is(?= all)","gi");
|
The marked text below shows where the RegExp gets a match:
Try-It-Yourself Demos
?!
How to use the "?!" modifier to search for a string not followed by another
string using a string object.
?!
How to use the "?!" modifier to search for a string not followed by another
string using a regular expression object.
Complete RegExp Object Reference
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