(?i)applies the following effective flags to the remainder of the pattern: gmi i modifier: insensitive. Matches without distinguishing uppercase and lowercase letters
<the literal < (6010 / 748 / 3C16)
Negated Character Class[^>]+ +matches at least one character outside the set below:
>the literal > (6210 / 768 / 3E16)
(*SKIP)acts like (*PRUNE), but the next unanchored match attempt starts where (*SKIP) was reached instead of at the next subject character
(*F)forces the current match attempt to fail at this position