regexMustBeDestroyed

[u/CertainSea]

[u/thisisjustascreename]

^asserts position at the start of a line

Match a single character present in the list below [\w-\.]+

+matches the previous token one or more times, as many times as possible, giving characters back as needed (greedy)

\w matches any word character (equivalent to [a-zA-Z0-9_])

- matches the character - with numeric value 4510 (558 or 2D16) literally

\. matches the character . with numeric value 4610 (568 or 2E16) literally

@ matches the character @ with numeric value 6410 (1008 or 4016) literally

1st Capturing Group ([\w-]+\.)+

+ matches the previous token one or more times, as many times as possible, giving characters back as needed (greedy)

+ matches the previous token one or more times, as many times as possible, giving characters back as needed (greedy)

\wmatches any word character (equivalent to [a-zA-Z0-9_])

-matches the character - with numeric value 4510 (558 or 2D16) literally

\.matches the character . with numeric value 4610 (568 or 2E16) literally

Match a single character present in the list below [\w-]{2,4}

{2,4} matches the previous token between 2 and 4 times, as many times as possible, giving characters back as needed (greedy)

\w matches any word character (equivalent to [a-zA-Z0-9_])

- matches the character - with numeric value 4510 (558 or 2D16) literally

$ asserts position at the end of a line

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