\ban ASCII word boundary
+matches at least one character from the set below:
A-Zone character from A (6510) to Z (9010) (case insensitive)
\s*any whitespace character, repeated any number of times
Non-Capturing Group(?:[=!]=|[<>]=?) =the literal = (6110 / 758 / 3D16)
!the literal ! (3310 / 418 / 2116)
=the literal = (6110 / 758 / 3D16)
<the literal < (6010 / 748 / 3C16)
>the literal > (6210 / 768 / 3E16)
=?optionally matches the literal = (6110 / 758 / 3D16)
\s*any whitespace character, repeated any number of times
\d+a digit, repeated at least once
\ban ASCII word boundary
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
i modifier: insensitive. Matches without distinguishing uppercase and lowercase letters