Javascript RegEx to validate file name pattern

Question

I need to validate file name with following pattern....

File name(string) should not be null or empty
File name(string) should have extension as .INI
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

minitech's answer below raises a good point. Can you clarify what you mean by "should have 'gen1'"? That is -- can you give some examples of valid filenames? — ruakh
– ruakh, Commented Mar 23, 2012 at 15:22

Ry- · Accepted Answer · 2012-03-23 15:33:06Z

2

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*.

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

edited Mar 23, 2012 at 15:33

answered Mar 23, 2012 at 15:20

Ry-♦

226k56 gold badges496 silver badges504 bronze badges

Sign up to request clarification or add additional context in comments.

1 Comment

StartingFromScratch Over a year ago

Thanks Minitech... worked perfectly bud... You should have opt for maxtech avatar... :)

ruakh · Accepted Answer · 2012-03-23 15:18:05Z

0

I agree, this sounds perfectly suited to regexes. Assuming that N has to be a positive decimal integer, and it can't have leading 0s, you can write:

/^gen[1-9][0-9]*\.INI$/

which means "start-of-string (^), followed by gen, followed by a digit in the range 1-9, followed by zero or more (*) digits in the range 0-9, followed by a literal dot (\.), followed by INI, followed by end-of-string ($)".

answered Mar 23, 2012 at 15:18

ruakh

185k29 gold badges292 silver badges324 bronze badges

Collectives™ on Stack Overflow

Javascript RegEx to validate file name pattern

2 Answers 2

1 Comment

Comments

Your Answer

Hot Network Questions

Collectives™ on Stack Overflow

2 Answers 2

1 Comment

Comments

Your Answer

Sign up or log in

Post as a guest

Related