Regular Expressions 101

Explanation
Pro

\d{4}a digit, repeated exactly 4 times

Global pattern flags

g modifier: global. Finds all matches instead of stopping after the first

m modifier: multiline. Causes ^ and $ to match the start and end of each line, not only the start and end of the string

Detailed match information will be displayed here automatically.

25 tokens

\d{4}

New

2\06\1998
21.11.1998  
18-02-2001
03/05/1999 
20 july 1999

2\06\1998
21.11.1998  
18-02-2001
03/05/1999 
20 july 1999