\ba Unicode word boundary
Email:the literal text Email: (case sensitive) \s*a Unicode whitespace character, repeated any number of times
<athe literal text <a (case sensitive) \sa Unicode whitespace character
Negated Character Class[^<>]* *matches any number of characters outside the set below:
<the literal < (6010 / 748 / 3C16)
>the literal > (6210 / 768 / 3E16)
\ba Unicode word boundary
href="mailto:the literal text href="mailto: (case sensitive) Negated Character Class[^"]+ +matches at least one character outside the set below:
"the literal " (3410 / 428 / 2216)
"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