Unfortuantely /c is taken for /gc matches. My problem with "traditional" is that the term "traditional" is how I have been thinking of the /a variant, which makes things match the way perl did before it supported unicode. But maybe the difference is one is "Perl-traditional" and the other is "Perl-with-unicode-traditional". I dont know. Got any other ideas?

BTW you can see the ones that are taken below:

/* chars and strings used as regex pattern modifiers
 * Singlular is a 'c'har, plural is a "string"
 *
 * NOTE, KEEPCOPY was originally 'k', but was changed to 'p' for prese
+rve
 * for compatibility reasons with Regexp::Common which highjacked (?k:
+...)
 * for its own uses. So 'k' is out as well.
 */
#define EXEC_PAT_MOD         'e'
#define KEEPCOPY_PAT_MOD     'p'
#define ONCE_PAT_MOD         'o'
#define GLOBAL_PAT_MOD       'g'
#define CONTINUE_PAT_MOD     'c'
#define MULTILINE_PAT_MOD    'm'
#define SINGLE_PAT_MOD       's'
#define IGNORE_PAT_MOD       'i'
#define XTENDED_PAT_MOD      'x'

#define BROKEN_SEM_PAT_MOD   'b'
#define LOCALE_SEM_PAT_MOD   'l'
#define PERL_SEM_PAT_MOD     'a'
#define UNI_SEM_PAT_MOD      'u'

#define ONCE_PAT_MODS        "o"
#define KEEPCOPY_PAT_MODS    "p"
#define EXEC_PAT_MODS        "e"
#define LOOP_PAT_MODS        "gc"

#define STD_PAT_MODS        "msix"
#define SEM_PAT_MODS        "blau"

#define INT_PAT_MODS    STD_PAT_MODS    KEEPCOPY_PAT_MODS 

#define EXT_PAT_MODS    ONCE_PAT_MODS   KEEPCOPY_PAT_MODS
#define QR_PAT_MODS     STD_PAT_MODS    EXT_PAT_MODS  SEM_PAT_MODS
#define M_PAT_MODS      QR_PAT_MODS     LOOP_PAT_MODS
#define S_PAT_MODS      M_PAT_MODS      EXEC_PAT_MODS
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