• POSIX API disabled by default for Unix (* Enabled by: configure --enable-posix-api=yes)
• Update Unicode version 13.0.0
• NEW: Code point sequence notation \x{HHHH HHHH ...}, \o{OOOO OOOO ...}
• NEW API: retry limit in search functions
• NEW API: maximum nesting level of subexp call
• Fixed behavior of isolated options in Perl and Java syntaxes. /...(?i).../