r"
^\s*
(?:
(?P<date>
(?:[\[<\(]\s*)? # opening bracket
(?:
# date time
(?:
# date
(?:
(?: # matches mm-dd-yyyy mm-dd-yy mm-dd
\d{1,2}-\d{1,2}
(?:
-
(?:\d{4}|\d{2})
)?
)
|
(?: # matches mm/dd/yyyy mm/dd/yy mm/dd
\d{1,2}\/\d{1,2}
(?:
\/
(?:\d{4}|\d{2})
)?
)
)
\s+
# time
\d{1,2}:\d{2}
(?::\d{2})?
(?:
\s*
(?:AM|PM)
)?
)
|
# time date
(?:
# time
\d{1,2}:\d{2}
(?::\d{2})?
(?:
\s*
(?:AM|PM)
)?
\s+
# date
(?:
(?: # matches mm-dd-yyyy mm-dd-yy mm-dd
\d{1,2}-\d{1,2}
(?:
-
(?:\d{4}|\d{2})
)?
)
|
(?: # matches mm/dd/yyyy mm/dd/yy mm/dd
\d{1,2}\/\d{1,2}
(?:
\/
(?:\d{4}|\d{2})
)?
)
)
)
|
# time only
(?:
\d{1,2}:\d{2}
(?::\d{2})?
(?:
\s*
(?:AM|PM)
)?
)
)
(?:\s*[\)>\]])? # closing bracket
)
\s+
)?
(?P<name>
(?:
(?:<\s*[^\s:>]+\s*>) # match <Username>
|
(?:[^\s:]+:) # match Username:
)
)
\s+
(?P<message>.*)
$
"
gxm