<the literal < (6010 / 748 / 3C16)
\s*any whitespace character, repeated any number of times
\ban ASCII word boundary
athe literal a (9710 / 1418 / 6116) (case sensitive)
\ban ASCII word boundary
.*?any character, repeated any number of times
hrefthe literal text href (case sensitive) g modifier: global. Finds all matches instead of stopping after the first
s modifier: single line. Allows a dot to match line terminators