RegExp.prototype.dotAll - JavaScript 编辑

The dotAll property indicates whether or not the "s" flag is used with the regular expression. dotAll is a read-only property of an individual regular expression instance.

The source for this interactive example is stored in a GitHub repository. If you'd like to contribute to the interactive examples project, please clone https://github.com/mdn/interactive-examples and send us a pull request.

Description

The value of dotAll is a Boolean and true if the "s" flag was used; otherwise, false. The "s" flag indicates that the dot special character (".") should additionally match the following line terminator ("newline") characters in a string, which it would not match otherwise:

• U+000A LINE FEED (LF) ("\n")
• U+000D CARRIAGE RETURN (CR) ("\r")
• U+2028 LINE SEPARATOR
• U+2029 PARAGRAPH SEPARATOR

This effectively means the dot will match any character on the Unicode Basic Multilingual Plane (BMP). To allow it to match astral characters, the "u" (unicode) flag should be used. Using both flags in conjunction allows the dot to match any Unicode character, without exceptions.

You cannot change this property directly.

Examples

Using dotAll

var str1 = 'bar\nexample foo example';

var regex1 = new RegExp('bar.example','s');

console.log(regex1.dotAll); // Output: true

console.log(str1.replace(regex1,'')); // Output: foo example

var str2 = 'bar\nexample foo example';

var regex2 = new RegExp('bar.example');

console.log(regex2.dotAll); // Output: false

console.log(str2.replace(regex2,'')); // Output: bar
                                      //         example foo example

Specifications

Browser compatibility

BCD tables only load in the browser

See also

• RegExp.lastIndex
• RegExp.prototype.global
• RegExp.prototype.ignoreCase
• RegExp.prototype.multiline
• RegExp.prototype.source
• RegExp.prototype.sticky
• RegExp.prototype.unicode