On Tuesday 07 November 2006 02:55, Andrew Sackville-West wrote:
> On Tue, Nov 07, 2006 at 01:00:34AM +1100, John O'Hagan wrote:
[...]
> > You're right; but the OP, Michael, gave the above scenario as his
> > problem. If your situation were the case, though, I guess we could use tr
> > -d '-' to get rid of all the hyphens first as well.
>
> the problem there is what if the desired result word includes a
> hyphen, then you'll have modified your result. I think you should go
> ahead and tr -d '\n' | tr ' ' '\n' | and then grep for a regex of
> Processor that allows for hyphens. you could limit it to the usual
> hyphen locations Pro-cess-or or is it Pro-ces-sor?
>
> here's another problem. target word is at end of line with processor
> at beginning of next line. There is only a newline between them and
> so the result becomes
>
> test
> word
> target-wordProcessor
> other
> junk
>
> you're grep will return 'word' instead of 'target-word'. You'd have to
> use a n old find-replace trick
>
> tr '\n' ' ' | tr -s ' ' '\n' | grep -B1 'Pro-*cess-*or' | grep -v
> 'Pro-*cess-*or\--'
>
>
> this replaces newlines with spaces and then replaces all single or
> multiple occurences of spaces with newlines. this allows that edge
> case above to come through properly. Then I think the grep is right
> to match zero or more hyphens in processor.
>
I tried this, and found that replacing the newlines with spaces stops the grep
from working because it puts spaces in the middle of any occurrences
of "Processor", but I see what you mean about the edge case. I think this
version takes care of it, plus it is hyphen-agnostic:
tr -d '\n' <IN | sed s/P-*r-*o-*c-*e-*s-*s-*o-*r/' Processor'/g |
tr -s ' ' '\n' | grep -B1 'Processor' | grep -v 'Processor\|--'
removing newlines, replacing all cases of (non-)hyphenated "Processor" with a
space followed by "Processor", then doing the grep. And here's a Python
version using the re module to deal with the hyphens ( the edge case takes
care of itself here):
import re
for i in re.split('P-?r-?o-?c-?e-?s-?s-?o-?r',
open('IN').read().replace('\n', ''))[0:-1]:
print i.split()[-1]
Have we done this to death yet? :)
Regards,
John
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