Java regular expression word match

Question

I have 3 values IU, PRI and RET. if my input string contains any one or more value(s),
the Java regular expression should return true.

Ex:
Values : IU PRI RET 
Input String : "put returns UI between paragraphs"

The Input string contains "UI" word, the Java regular expression should return true.

Answer 1

You need word boundaries for that:

boolean foundMatch = false;
Pattern regex = Pattern.compile("\\b(?:UI|PRI|RET)\\b");
Matcher regexMatcher = regex.matcher(subjectString);
foundMatch = regexMatcher.find();

Answer 2

Try

String s= "A IU somehting PRI something RET whatever";

Pattern p= Pattern.compile("(IU|PRI|RET)");
Matcher m= p.matcher(s);
while (m.find()) {
    String matched= m.group(1);
    System.out.println(matched);
}

It prints:

IU
PRI
RET