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JavaScript RegExp ? Quantifier

❮ JavaScript RegExp Object

Example

Do a global search for 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 expression gets a match:

1, 100 or 1000?
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Definition and Usage

The n? quantifier matches any string that contains zero or one occurrences of n.


Browser Support

Expression
? Yes Yes Yes Yes Yes

Syntax

new RegExp("n?")

or simply:

/n?/

Syntax with modifiers

new RegExp("n?","g")

or simply:

/\n?/g

❮ JavaScript RegExp Object