How to use (?:..) in regex

Question

I searched about this in regular expression tutorial.They mentioned like below.

(?:...)
A non-capturing version of regular parentheses. Matches whatever regular expression is inside the parentheses, but the substring matched by the group cannot be retrieved after performing a match or referenced later in the pattern.

But i don't know how to use this in regex. Pls explain me with example in java.

Answer 1

https://www.w3schools.com/java/java_regex.asp

https://www.javatpoint.com/java-regex

And many more...search in google

Answer 2

Regular Expressions

https://docs.oracle.com/javase/tutorial/essential/regex/index.html