regex

'regex' not found in section 7, but available here:

/usr/man/html.1fmli/regex.1fmli.html
/usr/man/html.3bsd/regex.3bsd.html
/usr/man/html.3C/regcmp.3C.html
/usr/man/html.3G/regcmp.3G.html
/usr/man/html.5/regex.5.html