Fix regex to detect negative numbers in rules
Fix regex to detect negative numbers in rules

Also fix an error when parsing rules like:

-0.4 RCVD_IN_IADB_LISTED    RBL: Participates in the IADB system
                            [192.168.11.7 listed in iadb.isipp.com]

Previously it was detecting two rules: 0.4 RCVD_IN_IADB_LISTED and 11.7 listed in iadb.isipp.com

codefriar/RubySpamAssassin,noeticpenguin/RubySpamAssassin