Question

I need to validate file name with following pattern….

1. File name(string) should not be null or empty
2. File name(string) should have extension as .INI
3. File name(string) should have “gen1” or “gen2” or “gen3″… genN where N has to be number.

We have already done the implementation with Javascript string functions but it looked little messy..

I am really interested in Validation-3 of “genN” which can be done more gracefully with RegEx

Answer 1

By “should have genN“, do you mean:

• Should be named gen#.ini?

  /^gen\d\.ini$/i
  

• Should contain gen#?

  /^.*gen\d.*\.ini$/i
  

Also, if you want more than 0 to 9 in those, change \d to \d+. If you only want to accept 1 and onwards, [1-9]. Both these requirements? [1-9]\d*.

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Here’s a helpful picker that should make the right regular expression for you.