CODEWITHSUNDEEP
javascriptregex
Saurabh Kumar
Saurabh Kumar

Reputation: 16651

regex to get the number from the end of a string

i have a id like stringNumber variable like the one as follows : example12 I need some javascript regex to extract 12 from the string."example" will be constant for all id and just the number will be different.

Upvotes: 66

Views: 71288

Answers (2)

alex
alex

Reputation: 490153

This regular expression matches numbers at the end of the string.

var matches = str.match(/\d+$/);

It will return an Array with its 0th element the match, if successful. Otherwise, it will return null.

Before accessing the 0 member, ensure the match was made.

if (matches) {
    number = matches[0];
}

jsFiddle.

If you must have it as a Number, you can use a function to convert it, such as parseInt().

number = parseInt(number, 10);

Upvotes: 108

jensgram
jensgram

Reputation: 31508

RegEx:

var str = "example12";
parseInt(str.match(/\d+$/)[0], 10);

String manipulation:

var str = "example12",
    prefix = "example";
parseInt(str.substring(prefix.length), 10);

Upvotes: 15

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