add_compile_string_length  496 regcomp.c            r = add_compile_string_length(prev, prev_len, blen, reg, ambig);
add_compile_string_length  504 regcomp.c        r = add_compile_string_length(prev, prev_len, blen, reg, ambig);
add_compile_string_length  515 regcomp.c        return add_compile_string_length(sn->s, 1 /* sb */, sn->end - sn->s, reg, 0);