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I'm trying to write a regex to allow phone country codes in this format: +NNNN, where N is a number. I tried with this one but it didn't work: 

/^\\+|[0-9]+$/

What is wrong?

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    I think its allowing more than 4 numbers. What about /^\\+[0-9]{4}$/ ? Commented Mar 12, 2014 at 14:36
  • Well, it's JavaScript so obviously this wouldn't work due to the improper escaping. Commented Mar 12, 2014 at 14:44

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What about that?

/^\+[0-9]{1,4}$/
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4 Comments

Won't this match +9 or +99, which is not what the OP asks?
I have a extra problem, I should allow +NNNN but also NNNNN in this way only the first one is allowed, how I can fix that? I tough for that reason I had the | pipe
To allow '+' being optional, add a '?' symbol after the plus sign: /^\+?[0-9]{1,4}$/
Also, the pipe symbol is used to match between several alternatives, but I don't think this is going to help you with that.
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Why do you use pipe inside your regex. Just remove it. Using pipe actually bisecting your regex into two.

/^\\+[0-9]+$/
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Regex: /^\+[0-9]{4}$/

Matches: +9999

  1. \+ matches + literally.
  2. [0-9]{4} matches 4 occurrences of a digit.
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