Extract partial content using regex

Question

I am trying to extract 14-A2F out of P‡GUID/CT-14-A2F2/SU-14-1F939(match til /) or P‡GUID/CT-14-A2F2(match at the end of the line)

    final Pattern pattern = Pattern.compile("CT-[a-zA-Z0-9-\\-]+(/|\\z)");
    final Matcher matcher = pattern.matcher("P‡GUID/CT-14-A2F2/SU-14-1F939");

    matcher.find();
    matcher.group();

no success so far, is there something wrong with my pattern or I this is not the use case for matcher.group

Answer 1

In your regex CT-[a-zA-Z0-9-\\-]+(/|\\z) you match CT-[a-zA-Z0-9-\\-]+ and then you use a capturing group for the last part which in this case will capture a forward slash. If you use matcher.group(); you will get the whole match which will be CT-14-A2F2/

You could shift the capturing group to the first part and then in the code refer to the first capturing group:

CT-([a-zA-Z0-9-\-]+)(?:/|\z)

In Java:

CT-([a-zA-Z0-9-\\-]+)(?:/|\\z)

final Pattern pattern = Pattern.compile("CT-([a-zA-Z0-9-\\-]+)(?:/|\\z)");
final Matcher matcher = pattern.matcher("P‡GUID/CT-14-A2F2/SU-14-1F939");

matcher.find();
System.out.println(matcher.group(1)); // 14-A2F2

Demo

Answer 2

This regex will match everything between two forward slashes. take the group out of it which is in parenthesis.

/([^/]*)/

you don't need to escape forward slash

Answer 3

Try Regex: (?<=CT-)[a-zA-Z0-9-\\]+(?=\/|$)

Demo