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void rmsp(SV * sv) {
  char * end;
  int length;
...
  }
  if( length >= 0 ) SvCUR_set(sv, length);
}

Benchmark: timing 1000000 iterations of inline, regex...
    inline:  6 wallclock secs ( 4.19 usr +  0.01 sys =  4.20 CPU)
     regex:  9 wallclock secs ( 7.71 usr +  0.02 sys =  7.73 CPU)