How I use RegExp in my Java program?

How I use RegExp in my Java program?

References

Reference NO 1

http://www.javacodegeeks.com/2012/11/java-regular-expression-tutorial-with-examples.html

Reference NO 2

http://stackoverflow.com/questions/13639902/how-i-use-regexp-in-my-java-program

Reference NO 3

http://ocpsoft.org/opensource/guide-to-regular-expressions-in-java-part-1/

Reference NO 4

http://www.regular-expressions.info/java.html

Reference NO 5

https://forums.oracle.com/thread/2063336

Reference NO 6

http://ostermiller.org/findcomment.html

Reference NO 7

http://javarevisited.blogspot.com/2012/10/regular-expression-example-in-java-to-check-String-number.html

Reference NO 8

http://uk.answers.yahoo.com/question/index?qid=20130425120542AA7KxuI