casefold?()
Returns the value of the case-insensitive flag.
/a/.casefold? #=> false /a/i.casefold? #=> true /(?i:a)/.casefold? #=> false
static VALUE rb_reg_casefold_p(VALUE re) { rb_reg_check(re); if (RREGEXP_PTR(re)->options & ONIG_OPTION_IGNORECASE) return Qtrue; return Qfalse; }