replace pattern in text file

Question

Below my sample html file:

some text here <img src="http://site.com/7b399e20/77165/5fa/2a31ffb8.jpg"/> sometext here

some text here <img src="http://site.com/7b399e20/2a31ffb8.jpg"/> sometext here

some text here <img src="http://site.com/7b399e20/2a31ffb8.png"/> sometext here

some text here <img src="http://site.com/2a31ffb8.jpeg"/> sometext here

how do I make such a transformation:

some text here <img src="web/2a31ffb8.jpg"/> sometext here

some text here <img src="web/2a31ffb8.jpg"/> sometext here

some text here <img src="web/2a31ffb8.png"/> sometext here

some text here <img src="web/2a31ffb8.jpeg"/> sometext here

Thanks

Colin Fine · Accepted Answer · 2011-12-05 12:06:58Z

3

I'll use Perl, because I know the syntax without having to look it up, but it would be very similar in awk or sed, as tekknolagi says:

perl -pi -e 's|http://site.com/.*([^/]+)"/>|web/$1"/>|;'  <filename>

This will preserve everything between the last / and the "

edited Dec 5, 2011 at 12:06

answered Dec 5, 2011 at 11:54

Colin Fine

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7 Comments

Zsolt Botykai Over a year ago

It will fail on lines when there are " chars after closing the img src="..." part as this regex can be greedy.

Noufal Ibrahim Over a year ago

+1. Perl's the way to go for this kind of thing although your regexp would munge other URLs in the file as well which might not be desired.

Colin Fine Over a year ago

@ZsoltBotykai: true. I have edited the script to make it pickier.

Zsolt Botykai Over a year ago

@ColinFine still no good. It will match the whole string (e.g.): http://site.com/valamisemmi.jpg" akarmi " barmi " semmi "

Colin Fine Over a year ago

@ZsoltBotykai: No, only where the " is immediately followed by />

|

Zsolt Botykai · Accepted Answer · 2011-12-05 11:56:04Z

1

sed -i 's:\(img src="\).*\(/[^"/]\+\.[^"]\+"\):\1web\2:' INPUTFILE

Might do it in place.

HTH

answered Dec 5, 2011 at 11:56

Zsolt Botykai

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Comments

hzm · Accepted Answer · 2011-12-05 12:06:34Z

-1

What about using perl script? I have put your sample text into file foo.txt and here is the result:

$ cat foo.txt | perl -pe 's#http://.*/([a-z0-9A-Z]*\.)#web/\1#'
some text here <img src="web/2a31ffb8.jpg"/> sometext here
some text here <img src="web/2a31ffb8.jpg"/> sometext here
some text here <img src="web/2a31ffb8.png"/> sometext here
some text here <img src="web/2a31ffb8.jpeg"/> sometext here

answered Dec 5, 2011 at 12:06

hzm

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1 Comment

Zsolt Botykai Over a year ago

Won't work correctly if there are more non img related links are on the line (greedy regex).

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