^start of line
X-Mimecast-Spam-Scorethe literal text X-Mimecast-Spam-Score (case sensitive) \:the literal : (5810 / 728 / 3A16)
the literal (3210 / 408 / 2016)
\ban ASCII word boundary
7-9one character from 7 (5510) to 9 (5710)
1the literal 1 (4910 / 618 / 3116)
2the literal 2 (5010 / 628 / 3216)
0-9one character from 0 (4810) to 9 (5710)
\ban ASCII word boundary
\na line-feed (newline) character (ASCII 10)
Xthe literal X (8810 / 1308 / 5816) (case sensitive)
\-the literal - (4510 / 558 / 2D16)
Mimecastthe literal text Mimecast (case sensitive) \-the literal - (4510 / 558 / 2D16)
Spamthe literal text Spam (case sensitive) \-the literal - (4510 / 558 / 2D16)
Signaturethe literal text Signature (case sensitive) \:the literal : (5810 / 728 / 3A16)
yesthe literal text yes (case sensitive) $end of line
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