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```
  ./Configure -des -Doptimize='-g -O2'
```

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(gdb) break S_regmatch
Breakpoint 1 at 0x810d0be: file regexec.c, line 2272.
...
1   breakpoint     keep y   0x0810d0be in S_regmatch at regexec.c:2272
        breakpoint already hit 1713 times
        ignore next 98287 hits