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Replacing a string with its substring

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# 1  
Old 08-20-2011
Replacing a string with its substring
Hi All,

Below is some sample content of my input file:

There are many types and traditions of anarchism, some of which are [[mutually exclusive]]. Strains of anarchism have been divided into the categories of [[social anarchism|social]] and [[individualist anarchism]] or similar dual classifications. Anarchism is often considered to be a radical [[left-wing]] ideology, and much of [[anarchist economics]] and [[anarchist law|anarchist legal philosophy]] reflect [[anti-statism|anti-statist]] interpretations of [[anarcho-communism|communism]], [[collectivist anarchism|collectivism]], [[anarcho-syndicalism|syndicalism]] or [[participatory economics]].

For the above content, if the square bracket [[mutually exclusive]] doesnt contain the delimiter '|',the substring inside the brackets, mutually exclusive, should replace the whole pattern [[mutually exclusive]].

If the square bracket contain strings separated with '|' delimiter [[social anarchism|social]] , the substring after the final delimiter in that pattern, social, should replace the whole pattern [[social anarchism|social]].

I believe this would be possible with sed and awk commands. I tried it. As am not that much conversant in unix, i could not achieve this.

Any help is appreciated. Also please recommend some useful sites/books to learn sed,awk and other text processing commands.

Thanks
Satheesh
# 2  
Old 08-20-2011
Try:
Code:
perl -pe 's/\[\[[^\]]+\|([^\]]+)\]\]/\1/g;s/\[\[([^\]]+)\]\]/\1/g' input

This User Gave Thanks to bartus11 For This Post:
satheeshkumar
# 3  
Old 08-20-2011
Thats Great Bartus. it is working. Do u suggest perl over shell scripts for text processing.

If so, please recommend me some sites to learn perl.

Regards
Satheesh
# 4  
Old 08-20-2011
To learn Perl you need this book: Learning Perl, Third Edition - O'Reilly Media
# 5  
Old 08-21-2011
Thank you Bartus Smilie
# 6  
Old 08-22-2011
Alternatively, a single regex could be used with the substitution operator like so -

Code:
$
$
$ cat f8
There are many types and traditions of anarchism, some of which are [[mutually exclusive]].
Strains of anarchism have been divided into the categories of [[social anarchism|social]]
and [[individualist anarchism]] or similar dual classifications. Anarchism is often
considered to be a radical [[left-wing]] ideology, and much of [[anarchist economics]]
and [[anarchist law|anarchist legal philosophy]] reflect [[anti-statism|anti-statist]]
interpretations of [[anarcho-communism|communism]], [[collectivist anarchism|collectivism]],
[[anarcho-syndicalism|syndicalism]] or [[participatory economics]].
$
$
$
$ perl -plne 's/\[\[[^|]*?\|*([^|]*?)\]\]/$1/g' f8
There are many types and traditions of anarchism, some of which are mutually exclusive.
Strains of anarchism have been divided into the categories of social
and individualist anarchism or similar dual classifications. Anarchism is often
considered to be a radical left-wing ideology, and much of anarchist economics
and anarchist legal philosophy reflect anti-statist
interpretations of communism, collectivism,
syndicalism or participatory economics.
$
$

tyler_durden
This User Gave Thanks to durden_tyler For This Post:
satheeshkumar
# 7  
Old 08-22-2011
Thank you very much tyler Smilie
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