Find file sequence with RegExp in Javascript

Question

I have a simple question:

How do I use RegExp in Javascript to find strings that matches this filter: *[0-9].png in order to filter out file sequences.

For example:

bird001.png
bird002.png
bird003.png

or

abc_1.png
abc_2.png

Should ignore strings like abc_1b.png and abc_abc.png I'm going to use it in a getFiles function.

var regExp = new RegExp(???);
var files = dir.getFiles(regExp);

Thanks in advance!

EDIT:

If I have a defined string, let's say

var beginningStr = "bird";

How can I check if a string matches the filter

beginningStr[0-9].png

? And ideally beginningString without case sensitivity. So that the filter would allow Bird01 and bird02.

Thanks again!

Answer 1

If I understood correctly, you need a regex that matches files with names which:

1. Begin with letters az , AZ
2. Optionally followed with single _
3. Followed by one or more digits
4. Ending with .png

Regex for this is [a-zA-Z]_{0,1}+\\d+\\.png

You could try online regex builders which offer immediate explanation of what you write.

Answer 2

Anything followed by [0-9] and ened by .png :

/^.*[0-9]\.png$/i

Or simply without begining (regex will find it itself):

/[0-9]\.png$/i

Answer 3

If I understood correctly,

var re = /\s[a-zA-Z]*[0-9]+\.png/g;
var filesArr = str.match(re);
filesArr.sort();// you can use own sort function

Please specify what is the dir variable

Answer 4

To get the PNG files without the sequenced? In one statement:

var files = dir.getFiles(/.*[^\d]+\.png$/i);

[^\\d]+ matches the non-number characters.

To only get the sequenced:

var files = dir.getFiles(/.*\d+\.png$/i);