(?i)applies the following effective flags to the remainder of the pattern: gmi i modifier: insensitive. Matches without distinguishing uppercase and lowercase letters
href="the literal text href=" (case insensitive) \s*any whitespace character, repeated any number of times
Negated Character Class[^\s"]*? *?matches any number of characters outside the set below:
\sany whitespace character
"the literal " (3410 / 428 / 2216)
\s*any whitespace character, repeated any number of times
"the literal " (3410 / 428 / 2216)
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