How to delete non-ASCII chars in file
mkbucc at gmail.com
Fri Sep 5 16:27:14 UTC 2008
On Fri, Sep 5, 2008 at 10:58 AM, Giorgos Keramidas
<keramida at ceid.upatras.gr> wrote:
> $ echo '^Fhello^F' | sed -e 's/[^[:print:]]*//' | hd
> 00000000 68 65 6c 6c 6f 06 0a |hello..|
> The matching pattern is wrong. You need `[^[:print:]]'. The character
> class of printable characters is `[:print:]', and you can negate the
> pattern with `[^xxxx]' where `xxxx' is the character class; hence the
> extra pair of brackets in `[^[:print:]]'.
In case you are interested, I've patched the re_format man page with this
example. I had read it, and it says :print: is the "name of the character
class." I think the concrete example helps clarify things.
A follow question--is it possible to use that statement in a Makefile (BSD)?
A straight cut 'n paste didn't work, and I couldn't figure out the escaping to
make it work.
cd to /usr/src/lib/libc/regex/ and apply this patch.
--- /dev/null Fri Sep 5 12:12:21 2008
+++ re_format.7 Fri Sep 5 12:18:29 2008
@@ -288,6 +288,10 @@
A locale may provide others.
A character class may not be used as an endpoint of a range.
+To match all characters not in a class, use a bracket expression
+.Ql [^[:print:]] .
There are two special cases\(dd of bracket expressions:
the bracket expressions
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