Reg-ex debugger

“Some people, when confronted with a problem, think “I know, I’ll use regular expressions.” Now they have two problems.” 

Great online tool for debugging your regular expressions:

https://eigenstate.org/notes/regex-debug

Example:

Pattern : [0-9]*(foo|bah?|baz).?[0-9]*

Inputs : 123bar666 , 123bath999

Result:

Building
Matched: 123bar666
	group 1: ba
coverage:
	[0-9]*(foo|bah?|baz).?[0-9]*
	^    ^^   ^^^^ ^    ^ ^    ^
Match failed at 40:
	[0-9]*(foo|bah?|baz).?[0-9]*
	~~~~~~~~~~~~~~~~~~~~~~^
	123bath999
	~~~~~~^