When optimizing performance in mruby-onig-regexp, symbols containing special characters or numbers are not supported by MRB_SYM or MRB_GVSYM macros, requiring runtime mrb_intern_lit() calls that create performance bottlenecks.
Target symbols: $~, $&, $`, $', $+, $0～$9, []

Current Limitations

// Cannot use these
MRB_GVSYM(~) // error: pasting "MRB_GVSYM__" and "~" does not give a valid preprocessing token
MRB_GVSYM(0) // error: ‘MRB_GVSYM__0’ undeclared (first use in this function); did you mean ‘MRB_GVSYM_2’?
MRB_SYM([])  // error: pasting "MRB_SYM__" and "[" does not give a valid preprocessing token

Current Workaround Issues

Currently using workarounds like below, but they have initialization overhead:

// Current workaround
static mrb_sym sym_dollar_tilde;
sym_dollar_tilde = mrb_intern_lit(mrb, "$~");

Could you please add support for symbols containing special characters and numbers to the MRB_SYM/MRB_GVSYM macros? This would significantly improve regular expression processing performance and enable efficient implementation of Ruby's regular expression library in mruby.