OP_BEGIN_LINE    1478 regcomp.c        case ANCHOR_BEGIN_LINE:     r = add_opcode(reg, OP_BEGIN_LINE);     break;
OP_BEGIN_LINE    6194 regcomp.c        { OP_BEGIN_LINE,          "begin-line",      ARG_NON },
OP_BEGIN_LINE    2383 regexec.c          CASE(OP_BEGIN_LINE)  MOP_IN(OP_BEGIN_LINE);