New pcre2_config() options PCRE2_CONFIG_NEVER_BACKSLASH_C and PCRE2_CONFIG_COMPILED_WIDTHS;

New pcre2_pattern_info() option PCRE2_INFO_EXTRAOPTIONS;

New public names for all the pcre2_compile() error numbers, new callout block flags field with PCRE2_CALLOUT_STARTMATCH and PCRE2_CALLOUT_BACKTRACK bits.