| OS | Man Page | Section | Hits |
|---|---|---|---|
| freebsd | re | 4 | 462 |
| linux | re | 3erl | 375 |
| x11r4 | re | 1 | 307 |
| osf1 | re | 7 | 296 |
| posix | re | 1 | 278 |
| osx | re | 3pm | 277 |
| opensolaris | re | 1 | 277 |
| debian | re | 4 | 276 |
| bsd | re | 1 | 276 |
| redhat | re | 3pm | 263 |
| plan9 | re | 1 | 263 |
| opendarwin | re | 1 | 259 |
| php | re | 1 | 256 |
| minix | re | 1 | 253 |
| v7 | re | 1 | 252 |
| xfree86 | re | 1 | 252 |
| mojave | re | 3pm | 246 |
| centos | re | 3pm | 245 |
| netbsd | re | 4 | 244 |
| suse | re | 3pm | 233 |
| debian | re | 1 | 223 |
| hpux | re | 1 | 216 |
| debian | re | 3perl | 166 |