match() method retrieves the matches when matching a string against a regular expression.
objis passed, it is implicitly converted to a RegExp by using
If the regular expression does not include the
g flag, returns the same result as RegExp.exec(). The returned Array has an extra
input property, which contains the original string that was parsed. In addition, it has an
index property, which represents the zero-based index of the match in the string.
If the regular expression includes the
g flag, the method returns an Array containing all matched substrings rather than match objects. Captured groups are not returned. If there were no matches, the method returns null.
In the following example,
match() is used to find
'Chapter' followed by 1 or more numeric characters followed by a decimal point and numeric character 0 or more times. The regular expression includes the
i flag so that case will be ignored.
var str = 'For more information, see Chapter 184.108.40.206'; var re = /(chapter \d+(\.\d)*)/i; var found = str.match(re); console.log(found); // logs ['Chapter 220.127.116.11', 'Chapter 18.104.22.168', '.1'] // 'Chapter 22.214.171.124' is the first match and the first value // remembered from `(Chapter \d+(\.\d)*)`. // '.1' is the last value remembered from `(\.\d)`.
The following example demonstrates the use of the global and ignore case flags with
match(). All letters A through E and a through e are returned, each its own element in the array.
var str = 'ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz'; var regexp = /[A-E]/gi; var matches_array = str.match(regexp); console.log(matches_array); // ['A', 'B', 'C', 'D', 'E', 'a', 'b', 'c', 'd', 'e']
match()is called with a global regular expression, the RegExp.lastIndex property (if specified) will be reset to
flagsargument is deprecated and throws a console warning (). This property is Gecko-only and will be removed in the future.