Matching groups in regex

Question

I wanted to match 2 groups using regex from the following Strings:

• LyraCalSWC20161203.png
• LyraL4C20180302.png

This is the regex I proposed - Lyra([A-Za-z]{3,6})+(\\d{8}).*

It should match 2 groups. The first one being L4C or CalSWC and the second group the date string which is 8 numbers.

I can get one group to work e.g) LyraL4C(\\d{8}).* but not the one to handle both variations.

Any help much appreciated

Thanks

Answer 1

You might want to use the generic \w selector picking all the words characters to match both versions of your samples

^Lyra(\w{3,6})(\d{8})\.png$

Demo

Escaped for java ^Lyra(\\w{3,6})(\\d{8})\\.png$

Answer 2

• Your pattern Lyra([A-Za-z]{3,6})+(\\d{8}).* is pretty good, but you miss that L4C contains not only letters, but also numbers.
• Next to that you also specified that the first group has between 3 and 6 elements {3,6} so don't need to use +

So you need Lyra([A-Za-z0-9]{3,6})(\\d{8}).*

See Regex demo