looks for a sad smiley with a backslash

If pattern match, then this number probably is a phone number in Taiwan.

regex to consider exceptions in log4j

get ip identifier, queue name, email domain and status from postfix log

Regex to match standard timecode format. (Updated with fewer groups).

If you need to grab an entire log line based on criteria (error,warning,notice,info,debug), use this Regexp and change the parameters accordingly.

stinks

Find all instances of a double dollar delimited centred LaTeX equation, for use with e.g. KaTeX

separate nginx log into database table-style fields