Regular Expressions 101

Pro

Group 1([\s\S]*?)

Character Class[\s\S]*?

*?matches any number of characters from the set below:

\sa Unicode whitespace character

\Sany character that is not Unicode whitespace

Group 2(\bunknown\b)

\ba Unicode word boundary

unknownthe literal text unknown (case sensitive)

\ba Unicode word boundary

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

([\s\S]*?)(\bunknown\b)

New

the women marathon unknown introduced at the summer olympics los angeles usa and unknown won

the women marathon unknown introduced at the summer olympics los angeles usa and unknown won