| OS | Man Page | Section | Hits |
|---|---|---|---|
| freebsd | re | 4 | 154 |
| linux | re | 3erl | 83 |
| debian | re | 4 | 73 |
| osf1 | re | 7 | 67 |
| netbsd | re | 4 | 49 |
| redhat | re | 3pm | 46 |
| opensolaris | re | 1 | 41 |
| bsd | re | 1 | 39 |
| debian | re | 1 | 38 |
| posix | re | 1 | 37 |
| opendarwin | re | 1 | 36 |
| osx | re | 3pm | 31 |
| v7 | re | 1 | 31 |
| plan9 | re | 1 | 30 |
| xfree86 | re | 1 | 30 |
| x11r4 | re | 1 | 29 |
| minix | re | 1 | 29 |
| mojave | re | 3pm | 28 |
| php | re | 1 | 23 |
| hpux | re | 1 | 20 |
| suse | re | 3pm | 18 |
| centos | re | 3pm | 13 |
| debian | re | 3perl | 12 |