OP_BEGIN_POSITION 1481 regcomp.c        case ANCHOR_BEGIN_POSITION: r = add_opcode(reg, OP_BEGIN_POSITION); break;
OP_BEGIN_POSITION 6197 regcomp.c        { OP_BEGIN_POSITION,      "begin-position",  ARG_NON },
OP_BEGIN_POSITION 2453 regexec.c          CASE(OP_BEGIN_POSITION)  MOP_IN(OP_BEGIN_POSITION);