| OS | Man Page | Section | Hits |
|---|---|---|---|
| linux | re | 3erl | 876 |
| freebsd | re | 4 | 771 |
| osf1 | re | 7 | 645 |
| redhat | re | 3pm | 632 |
| x11r4 | re | 1 | 612 |
| opensolaris | re | 1 | 606 |
| plan9 | re | 1 | 604 |
| bsd | re | 1 | 599 |
| xfree86 | re | 1 | 593 |
| minix | re | 1 | 593 |
| posix | re | 1 | 576 |
| debian | re | 1 | 563 |
| opendarwin | re | 1 | 557 |
| v7 | re | 1 | 551 |
| osx | re | 3pm | 549 |
| php | re | 1 | 548 |
| mojave | re | 3pm | 539 |
| hpux | re | 1 | 520 |
| debian | re | 4 | 518 |
| netbsd | re | 4 | 499 |
| centos | re | 3pm | 494 |
| suse | re | 3pm | 479 |
| debian | re | 3perl | 370 |