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I have a string that could be of this kind, for example :

String text = 'test AZ123AZ testtesttest';

I need to retrive this part of the string :

AZ123AZ

So for now I have something like this in my apex code :

String regexTest ='[A-Z]{2}[0-9]{3}[A-Z]{2}';
Matcher matcher =Pattern.compile(regexTest ).matcher(text);
Boolean result = matcher.find();

The boolean result gives me true if the regex type is in a string so it's ok, but I need to retrive the value of the regex to put it into another string (only this part of the string text is important for me)

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You can iterate over matching segments of your text using matcher.group():

while (matcher.find()) {
    System.debug(matcher.group());
}

If you know you only have one match, or only want the first match, you can just call matcher.group() directly without using a loop.

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