isxdigit          918 maint/gnulib/lib/dfa.c   {"xdigit", isxdigit, false},
isxdigit         3522 maint/gnulib/lib/regcomp.c     BUILD_CHARCLASS_LOOP (isxdigit);
isxdigit           50 maint/gnulib/tests/test-c-ctype.c           ASSERT (c_isxdigit (c) == (isxdigit (c) != 0));