list of self authored regular repressions for common uses

expressions.txt

\b[0-9a-f]{32}\b

This expression will stricly match an MD5 string

"d41d8cd98f00b204e9800998ecf8427e" will match

\b[0-9a-f]{8}-[0-9a-f]{4}-[0-9a-f]{4}-[0-9a-f]{4}-[0-9a-f]{12}\b

This expression will stricly match a canonical UUID string

"123e4567-e89b-12d3-a456-426655440000" will match
"123e4567-e89b-12d3-a456-426655440000a" will not
"123e4567e89b12d3a456426655440000" will also not match

\b((([0-9a-f]{2}:)){5}|(([0-9a-f]{2}-)){5})[0-9a-f]{2}\b/i

will test a string if it's a valid mac address
"19-2c-10-0c-dd-00" will match
"19:2c:10:0c:dd:00" will also match
"19:2c:10-0c:dd:00" however this will not match

\b((((\d|[1-9]\d|1\d{2}|2[0-4][0-5]|25[0-5])\.){3})(\d|[1-9]\d|1\d{2}|2[0-4][0-5]|25[0-5]))(\/(\d|[1-2]\d|3[0-1]))?\b

This expression will strictly match a valid IPv4 address
"127.0.0.1" will match
"127.0.0.-1" will not match
"127.256.0.1" will also not match

\b([0-9a-f]{1,4}:){7}[0-9a-f]{1,4}\b

This expression will strictly match a valid IPv6 address

"2001:0db8:0000:00f0:0000:ff00:0042:8329" will match
"2001:0db8:0000:f0:0000:ff00:42:8329" will also match