Does Wireshark support BGP regular expressions in filters?

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Wireshark does support Perl-compatible regular expressions using the matches or ~ operator for certain fields. To quote the wireshark-filter man page:

The "matches" or "~" operator allows a filter to apply to a specified Perl-compatible regular expression (PCRE). The "matches" operator is only implemented for protocols and for protocol fields with a text string representation. Matches are case-insensitive by default. For example, to search for a given WAP WSP User-Agent, you can write:

    wsp.user_agent matches "cldc"

This would match "cldc", "CLDC", "cLdC" or any other combination of upper and lower case letters.

You can force case sensitivity using

    wsp.user_agent matches "(?-i)cldc"

This is an example of PCRE's (?option) construct. (?-i) performs a case-sensitive pattern match but other options can be specified as well. More information can be found in the pcrepattern(3) man page at http://perldoc.perl.org/perlre.html).