Re: [9fans] regular expressions in plan9 different from the ones in unix? (at least linux)

[erik quanstrom <quanstro@coraid.com>]

utf-8 encoding will "just work" (unless the gnu folk are
rearranging characters with the bucky bit set) or if
the result depends on knowing the width of a character,
e.g. in

a)	a character class
b)	matching a single character with ".".

for example for a file "fu" with these lines

	α0
	β0
	α1

(no leading tab) i get these results with no
local settings at all.

	; grep δ fu
	δ0

works because as far as grep is concerned, the string
i asked for 03 b4 is in there.  this works, too

	; egrep '(ε|δ)0' fu
	ε0
	δ0

and this works because there is a character before
"0" on the line:

	; egrep '.0' fu
	ε0
	δ0

but this doesn't

	; egrep '[αβ]0' fu
	; egrep '^.0' fu

this is for gnu grep version

	; egrep --version
	egrep (GNU grep) 2.5.1


- erik