5.8. PCRE (optional)

"Perl compatible regular expressions". PCRE provides the pattern matching functionality required for the "matches" display filter operator.

You probably don't need this. GRegex, part of GLib 2.14 and later is a wrapper around PCRE. Wireshark's configure script will use it instead of PCRE if it is present.

5.8.1. Unix

If this library isn't already installed or available as a package for your platform, you can get it at: http://www.pcre.org/.

5.8.2. Win32 MSVC

You can get the latest version at: http://gnuwin32.sourceforge.net/packages/pcre.htm