Extract a string between 2 ref string from a file


 
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# 1  
Old 05-15-2012
Extract a string between 2 ref string from a file

Hi,

May i ask if someone share some command for extracting a string between 2 ref string in a txt file

My objective: i had a file with multiple lines and wants only to extract the string "watch?v=IbkAXOmEHpY" or "watch?v=<11 random character>", when i used "grep 'watch?=*' i got a results per line
Code:
<unneeded char>href="/watch?v=IbkAXOmEHpY&amp;feature=plcp<unneeded char>

, and used cut for finally.

What i would like is not having using grep and cut instead sed or similar built in command for extracting directly the "watch?v=IbkAXOmEHpY" without using grep first.

Maybe sed the first ref would be <href="> and end ref <&amp>

Im searching now and found some sed and perl but no luck at all..

Hope someone can share time..

Thanks in advance

Last edited by Scrutinizer; 05-15-2012 at 12:05 PM.. Reason: code tags instead of quote tags
# 2  
Old 05-15-2012
Code:
perl -nle '/href="\/([^&]+)/;print $1' file

# 3  
Old 05-15-2012
If your grep knows "-o", you could try something like:
Code:
grep -o 'watch?v=[^&;]*'

This User Gave Thanks to Scrutinizer For This Post:
# 4  
Old 05-15-2012
Quote:
Originally Posted by Scrutinizer
If your grep knows "-o", you could try something like:
Code:
grep -o 'watch?v=[^&;]*'

@Scrutinizer: works fine thanks, i would like to ask also how to exclude the empty 11 character, the results include the "watch?v=<empty>" i would like to exclude this one,

@bartus11: thanks also, but it will only works if all lines contain the
Quote:
<unneeded char>href="/watch?v=IbkAXOmEHpY&amp;feature=plcp<unneeded char>
"works if grep first and all lines contain the refference, the file contains also some other character or some lines thats doesn't have
Quote:
<unneeded char>href="/watch?v=IbkAXOmEHpY&amp;feature=plcp<unneeded char>
it seems i print also other line with other field set, by the way the file is a source web page.

By the way thanks for a quick response.
# 5  
Old 05-15-2012
You could run the output through: | grep -v '<empty>'
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