nopaste.txt

    case 'G':
      if (! IS_SYNTAX_OP(syn, ONIG_SYN_OP_ESC_CAPITAL_G_BEGIN_ANCHOR)) break;
      tok->type = TK_ANCHOR;
      tok->u.subtype = ANCHOR_BEGIN_POSITION;
      break;

// elsewhere
    case '^':
      if (! IS_SYNTAX_OP(syn, ONIG_SYN_OP_LINE_ANCHOR)) break;
      tok->type = TK_ANCHOR;
      tok->u.subtype = (IS_SINGLELINE(env->option)
			? ANCHOR_BEGIN_BUF : ANCHOR_BEGIN_LINE);
      break;


// regexec.c:

    case OP_BEGIN_POSITION:  MOP_IN(OP_BEGIN_POSITION);
      if (s != msa->start)
  goto fail;

      MOP_OUT;