RegExp.prototype.hasIndices

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

Description

The value of hasIndices is a Boolean and true if the "d" flag was used; otherwise, false. The "d" flag indicates that the result of a regular expression match should contain the start and end indices of the substrings of each capture group.

You cannot change this property directly.

Examples

Using hasIndices

const str1 = 'foo bar foo';

const regex1 = new RegExp('foo', 'gd');

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

console.log(regex1.exec(str1).indices[0]); // Output: Array [0, 3]
console.log(regex1.exec(str1).indices[0]); // Output: Array [8, 11]

const str2 = 'foo bar foo';

const regex2 = new RegExp('foo');

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

console.log(regex2.exec(str2).indices); // Output: undefined

Specifications

Browser compatibility

See also

• RegExp.lastIndex
• RegExp.prototype.exec()
• RegExp.prototype.dotAll
• RegExp.prototype.global
• RegExp.prototype.ignoreCase
• RegExp.prototype.multiline
• RegExp.prototype.source
• RegExp.prototype.sticky
• RegExp.prototype.unicode