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JavaScript Reference

JavaScript

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<a> <abbr> <address> <area> <article> <aside> <audio> <b> <base> <bdo> <blockquote> <body> <br> <button> <canvas> <caption> <cite> <code> <col> <colgroup> <datalist> <dd> <del> <details> <dfn> <dialog> <div> <dl> <dt> <em> <embed> <fieldset> <figcaption> <figure> <footer> <form> <head> <header> <h1> - <h6> <hr> <html> <i> <iframe> <img> <ins> <input> button <input> checkbox <input> color <input> date <input> datetime <input> datetime-local <input> email <input> file <input> hidden <input> image <input> month <input> number <input> password <input> radio <input> range <input> reset <input> search <input> submit <input> text <input> time <input> url <input> week <kbd> <keygen> <label> <legend> <li> <link> <map> <mark> <menu> <menuitem> <meta> <meter> <nav> <object> <ol> <optgroup> <option> <output> <p> <param> <pre> <progress> <q> <s> <samp> <script> <section> <select> <small> <source> <span> <strong> <style> <sub> <summary> <sup> <table> <td> <th> <tr> <textarea> <time> <title> <track> <u> <ul> <var> <video>

Other Objects

CSSStyleDeclaration

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?

Try it Yourself »

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