RegExp.constructor

The RegExp constructor creates a regular expression object for matching text with a pattern.

Syntax

new RegExp(pattern, flags?)

Parameters

• pattern

  A string that specifies the pattern of the regular expression.

• flags optional

  A string that contains flags that specify how to construct the regular expression.

  The following flags are supported:

  • g

    Global search. The regular expression will match all occurrences of the pattern in the target string.

  • d

    Generate indices for substring matches.

  • i

    Ignore case.

  • m

    Multi-line search (allows ^ and $ to match line terminators within the target string).

  • s

    Single-line search. . matches any character, including line terminators.

  • u

    Unicode; treat pattern as a sequence of Unicode code points.

  • y

    “Sticky” search that matches starting at the current position in the target string.

Return value

A new RegExp object.

Examples

(new RegExp("\\d+", "g")).test("123")

true

/\d+/g.test("123")

true