All regular expressions in mode files were rewritten to use java.util.regex instead of gnu.regexp.

HASH_CHAR handling of xxx_REGEXP elements has been updated, as explained in the section called “The SPAN_REGEXP Tag”.

The EXCLUDE_MATCH attribute got superseded by MATCH_TYPE. The attribute values translate from TRUE to CONTEXT and from FALSE to RULE, respectively. For more information see the section called “The MATCH_TYPE Attribute”.

NO_ESCAPE is now deprecated and ignored by the parsing engine. ESCAPE is now a valid attribute for SPAN and SPAN_REGEXP rules.