I have a folder with lots of images. All images are either type A or B, the only way to determine the type is by their name.

Type A Images -> 
12345-YZ.jpg or 232323-XZ.jpeg 

Type B images -> 
1231-WEAR-EWEF-DWW-ADAD.jpg or 345345-UWHDJ-asda-hshdshd.jpeg

What regex should I use to segregate the images??

Type A will always have one dash and then a few random characters. whereas type B it may have many words separated by a dash.

CodePudding user response：

You don't have to use regular expressions, you just need to differentiate by length.

Judging the length is much simpler than judging regular expressions

CodePudding user response：

So lets say the length of filenames cannot be an indicator of it's type, then

type A is:

^\d*-\w*\.jpe?g$
^\d*-\w*\.(jpg|jpeg)$

type B is:

^\d*-\w*(-\w*) \.jpe?g$
^\d*-\w*(-\w*) \.(jpg|jpeg)$

They are 2 of each but they mean the same thing, pick one depending if you prefer readable file format or the regex length.