Regex string pattern for filename

Question

I am uploading a file and I need to check whether the filename belongs to a particular pattern or not.

Example: AL-13-Annual DSH Audit.pdf

The first two characters "AL" can be anything but will be only 2 Uppercase characters, followed by a dash(-), followed by a 2 digit number, followed by a dash(-), followed by the rest('Annual DSH Audit.pdf'）.

This is what I have done so far.

[A-Z]{2}[\-][0-9]{2}[\-][A]{1}[nnual]{5}\s[DSH]{3}\s[A]{1}[udit]{4}\.[pdf]{3}

Please advice. Not sure how to proceed further to simplify this.

If you want to match a dash after the two upper case characters, then that's exactly what you need to add: `[A-Z]{2}-`. Add the characters you mentioned in your description. If you know how to match two uppercase characters, I assume you know how to match two digits. So what exactly is the problem? — Felix Kling, Mar 12 '19 at 19:14
Will "Annual DSH Audit" always be present, or can that be any string? I get the impression from your question that this is the case, just checking. — skwidbreth, Mar 12 '19 at 19:15
Do all the filenames have to have the substring `"Annual DSH Audit.pdf"` in them? — ibrahim mahrir, Mar 12 '19 at 19:20
`[...]` denote character groups, i.e. "match any one of these characters". Thus `[nnual]` is the same as `[nual]` and `[nnual]{5}` would match `nnnnn` or `nnuul`. If you you literally want to match a specific sequence of characters, then you just write them out as is. Don't use a character group: `Annual\sDSH\sAudit` — Felix Kling, Mar 12 '19 at 19:24
Yeah, looks like the files he uploads should have the same string with same cases — arunmmanoharan, Mar 12 '19 at 19:25
everything past the last `.` ? Any reason that would not work? — Ronnie Royston, Mar 12 '19 at 19:26
You should check out this website for testing regex patterns, it's very useful: https://regexr.com/4a34v — Chris Barr, Mar 12 '19 at 19:34

Chris Sandvik · Answer 1 · 2019-06-21T15:12:43.467

2

^[A-Z]{2}-\d{2}-Annual\sDSH\sAudit\.pdf$

*Edited to meet your requirements

Link to demo - https://regexr.com/4a344

edited Jun 21 '19 at 15:12

answered Mar 12 '19 at 19:22

Chris Sandvik

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Roko C. Buljan · Answer 2 · 2019-03-12T19:29:50.500

const matchesFormat = str => /^[A-Z]{2}-\d{2}-.+\.pdf$/.test(str);

console.log( matchesFormat('AL-13-Annual DSH Audit.pdf') ); // true
console.log( matchesFormat('ZZ-00-test.pdf') );             // true
console.log( matchesFormat('AL-13-Annual DSH Audit.jpg') ); // false
console.log( matchesFormat('AL-13Annual DSH Audit.pdf') );  // false
console.log( matchesFormat('K-13-Annual DSH Audit.pdf') );  // false
console.log( matchesFormat('AL-2-Annual DSH Audit.pdf') );  // false

and if you need to also match the rest Annual DSH Audit.pdf than:

https://regex101.com/r/NNtx6o/1

const isAuditPDF = str => /^[A-Z]{2}-\d{2}-Annual\sDSH\sAudit\.pdf$/.test(str);

console.log( isAuditPDF('AL-13-Annual DSH Audit.pdf') ); // true
console.log( isAuditPDF('ZZ-00-test.pdf') );             // false
console.log( isAuditPDF('AL-1-Annual DSH Audit.pdf') );  // false

Kamil Kiełczewski · Answer 3 · 2019-03-12T19:21:24.007

0

Try

^[A-Z]{2}-\d\d-

let t= /^[A-Z]{2}-\d\d-/.test('AL-13-Annual DSH Audit.pdf'); 
console.log(t);

edited Mar 12 '19 at 19:21

answered Mar 12 '19 at 19:17

Kamil Kiełczewski

85,173
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Regex string pattern for filename

3 Answers3