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JS & DOM Reference

JavaScript Objects

JS Array
JS Boolean
JS Date
JS Math
JS Number
JS String
JS RegExp
JS Functions

Browser Objects

DOM Window
DOM Navigator
DOM Screen
DOM History
DOM Location

HTML DOM Objects

DOM Document
DOM Anchor
DOM Area
DOM Base
DOM Body
DOM Button
DOM Event
DOM Form
DOM Frame
DOM Frameset
DOM IFrame
DOM Image
DOM Input Button
DOM Input Checkbox
DOM Input File
DOM Input Hidden
DOM Input Password
DOM Input Radio
DOM Input Reset
DOM Input Submit
DOM Input Text
DOM Link
DOM Meta
DOM Object
DOM Option
DOM Select
DOM Style
DOM Table
DOM TableCell
DOM TableRow
DOM Textarea

JavaScript RegExp ? Quantifier

RegExp Object Reference

JavaSript RegExp Object

Definition and Usage

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

Syntax

new RegExp("n?")

or simply:

/n?/

Example

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?

Try it yourself »

RegExp Object Reference

JavaSript RegExp Object

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