Regex Pattern In Between Two Exact Strings

Question

Hi I have this working code to detect a valid UUID pattern.

String pattern = "\\b[a-f0-9]{8}\\b-[a-f0-9]{4}-[a-f0-9]{4}-[a-f0-9]{4}-\\b[a-f0-9]{12}\\b";
Pattern r = Pattern.compile(pattern);
Matcher m = r.matcher(fileName);

This correctly detects strings like:

0101a8ef-db10-405a-a1d2-6bebdeb17625

I would like to add two exact strings on each side of this pattern like so:

FOLDER/0101a8ef-db10-405a-a1d2-6bebdeb17625.txt

Here is the code I am trying, but is not working:

String pattern = "FOLDER/\\b//[a-f0-9]{8}\\b-[a-f0-9]{4}-[a-f0-9]{4}-[a-f0-9]{4}-\\b[a-f0-9]{12}\\b.txt";
Pattern r = Pattern.compile(pattern);
Matcher m = r.matcher(uri.toString());

Why not like FOLDER/[a-f0-9]{8}-[a-f0-9]{4}-[a-f0-9]{4}-[a-f0-9]{4}-[a-f0-9]{12}\\.txt regex101.com/r/CJjLUP/1 — The fourth bird
– The fourth bird, Commented Jun 15, 2021 at 19:18
@shmosel Not sure, it was part of the code example that I got the first pattern from. — jeninja
– jeninja, Commented Jun 15, 2021 at 19:18
@Thefourthbird this works, thanks! You should add an answer to this post for future reference. — jeninja
– jeninja, Commented Jun 15, 2021 at 19:22

The fourth bird · Accepted Answer · 2021-06-15 19:27:36Z

2

There is a // in the pattern that is not in the example string. Besides that, you can omit the word boundaries in between a character a-f0-9 and a - because it is implicit.

Note to escape the dot to match it literally, and you can add the word boundaries at the start and at the end to prevent partial matches.

You could update the pattern to

\\bFOLDER/[a-f0-9]{8}-[a-f0-9]{4}-[a-f0-9]{4}-[a-f0-9]{4}-[a-f0-9]{12}\\.txt\\b

See a regex demo.

answered Jun 15, 2021 at 19:27

The fourth bird

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