Javascript regex pattern match

Question

I'm trying to build a regex to meet the following requirement

4 digits / 6 digits / 3 digits

e.g. 4444/666666/333

But, the last slash and 3 digits are optional

Here is what i have so far:

/^\d{4}[/]\d{6}[/]{0,1}\d{0,3}$/

However, if i enter 4444/666666333 or 4444/666666/ that will also pass :(

Is it possible to put in a condition that will force a slash, if the remaining 3 digits are entered? Or, if the final slash is entered, the remaining 3 digits must also be entered too?

thanks Scott

score 3 · Accepted Answer · answered Aug 02 '18 at 09:23

3

Try this pattern: ^\d{4}\/\d{6}(\/\d{3})?$.

Demo

answered Aug 02 '18 at 09:23

Michał Turczyn

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Agree. That's it. – Lam Pham Aug 02 '18 at 09:26
Hi Michal, that works perfect, thanks :) – Scott Aug 02 '18 at 09:28

score 0 · Answer 2 · answered Aug 02 '18 at 09:23

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/^\d{4}[/]\d{6}([/]\d{0,3})?$/ use group () to include the last slash and 3 digits ,and use (?) to match it or no

answered Aug 02 '18 at 09:23

Peng

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Hi Peng, that fixes the 4444/666666333 issue, but not 4444/666666/ – Scott Aug 02 '18 at 09:25
Hi Peng, i got it /^\d{4}[/]\d{6}([/]\d{3})?$/ - just removed the range from the last digit, thanks :) – Scott Aug 02 '18 at 09:27

Javascript regex pattern match

2 Answers2