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JavaScript RegExp ? Modifier

Definition and Usage

When the ? modifier is set the regular expression finds zero or one of a specific character.

Syntax

new RegExp("regexp?")
OR
/regexp?/

Parameter Description
regexp Required. The rest of the regular expression to use


Example

In the following code we will do a global search for any substring with a 1 followed by zero or one "0" characters:

var str = "1, 100 or 1000?";
var patt1 = /10?/g;

The marked text below shows where the RegExp gets a match:

1, 100 or 1000?
JavaScript RegExp ? Modifier Reviewed by 1000sourcecodes on 21:42 Rating: 5
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