Regular Expressions 101

Pro

Group 1(\S*)?

?repeats the group contents below at most once:

\S*any non-whitespace character, repeated any number of times

Group 2(key\=(?<foundkey>[[:alnum:]-]*))?

?repeats the group contents below at most once:

keythe literal text key (case sensitive)

\=the literal = (61₁₀ / 75₈ / 3D₁₆)

Group foundkey(?<foundkey>[[:alnum:]-]*)

Character Class[[:alnum:]-]*

*matches any number of characters from the set below:

[:alnum:]an alphanumeric character [a-zA-Z0-9]

-the literal - (45₁₀ / 55₈ / 2D₁₆)

\S*any non-whitespace character, repeated any number of times

Global pattern flags

x modifier: extended. Ignores unescaped whitespace and comments outside character classes

Detailed match information will be displayed here automatically.

25 tokens

 		(\S*)?                              	   
		(key\=(?<foundkey>[[:alnum:]-]*))?	   
     	\S*

New

-----------key=309---------------

-----------key=309---------------