Regex in java

Links for using regex in java:

Cheat sheet by zeroturnaround	:	http://files.zeroturnaround.com/pdf/zt_regular-expressions-cheat-sheet.pdf
Good tutorial by Vogella	:	http://www.vogella.com/tutorials/JavaRegularExpressions/article.html
Specification	:	https://docs.oracle.com/javase/7/docs/api/java/util/regex/Pattern.html
Regex tester	:	http://myregexp.com/