'?optionally matches the literal ' (3910 / 478 / 2716)
\w+any word character, repeated at least once
Non-Capturing Group(?:\s+\w+)* *repeats the group contents below any number of times:
\s+any whitespace character, repeated at least once
\w+any word character, repeated at least once
'?optionally matches the literal ' (3910 / 478 / 2716)
\s+any whitespace character, repeated at least once
<?optionally matches the literal < (6010 / 748 / 3C16)
Group 2(\S+@[\w.-]+\.[a-zA-Z]{2,4}\b) \S+any non-whitespace character, repeated at least once
@the literal @ (6410 / 1008 / 4016)
+matches at least one character from the set below:
\wany word character
.the literal . (4610 / 568 / 2E16)
-the literal - (4510 / 558 / 2D16)
\.the literal . (4610 / 568 / 2E16)
Character Class[a-zA-Z]{2,4} {2,4}matches between 2 and 4 characters from the set below:
a-zone character from a (9710) to z (12210) (case sensitive)
A-Zone character from A (6510) to Z (9010) (case sensitive)
\ban ASCII word boundary
g modifier: global. Finds all matches instead of stopping after the first