CODEWITHSUNDEEP
javascriptregex
user1897748
user1897748

Reputation:

Regex for digits and a plus sign

The conditions of the regex are as follows:

Starts with either digits or a '+' sign and ends with digits.

This is going to be used to validate a certain type of number. What I got so far is:

/^\d*|\+\d*$/

This regex seems to match any string though. How would a regex that matches my conditions look like?

The regex will be used in a JavaScript function.

Upvotes: 2

Views: 18362

Answers (2)

Avinash Raj
Avinash Raj

Reputation: 174696

I think you want something like this,

^(?:[+\d].*\d|\d)$
  • ^ Asserts that we are at the start.
  • [+\d] Matches a plus symbol or a digit.
  • .* Matches any character zero or more times.
  • \d Matches a digit.
  • | OR
  • \d A single digit.
  • $ Asserts that we are at the end.

Use this if you want to match also a line which has a single plus or digit.

^[+\d](?:.*\d)?$

DEMO

Upvotes: 15

anubhava
anubhava

Reputation: 785058

You need to use anchors ^ and $ on both sides of your regex and make first part + or digit) optional.

You can use this regex:

^([+\d].*)?\d$

RegEx Demo

Upvotes: 6

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