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Top Forums Shell Programming and Scripting Need help in string extraction using regular expressions Post 302319498 by durden_tyler on Monday 25th of May 2009 10:58:24 AM
Old 05-25-2009
Quote:
Originally Posted by akatraga
...
I am trying to extract the text after a matching pattern from a url using regular expression.
Ex:
Code:
http://locatlhost:2020/proxy/checkthisout

...
You can use regular expressions with more than one command.

Using plain old bash shell:

Code:
$
$ URL="http://localhost:2020/proxy/checkthisout"
$
$ echo ${URL##*/}
checkthisout
$
$ echo `expr "$URL" : '.*/\(.*$\)'`
checkthisout
$

Using perl:

Code:
$
$ echo "http://locatlhost:2020/proxy/checkthisout" | perl -ne 's#.*/##; print'
checkthisout
$

Using awk:

Code:
$
$ echo "http://locatlhost:2020/proxy/checkthisout" | awk 'sub(/.*\//,"")'
checkthisout
$

tyler_durden
 

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GCAP.1(1p)						User Contributed Perl Documentation						GCAP.1(1p)

NAME
gcap - Youtube closed caption downloader SYNOPSIS
gcap [-i] [-t] [-r <regexp>] [--proxy=<addr> | --no-proxy] [--help] <url> | <video_id> DESCRIPTION
gcap is a command line tool for downloading Youtube closed captions. The downloaded closed captions are saved in SubRip (srt) file format. The srt files are saved as "$videoid_$langid.srt" by default. OPTIONS
--help Print help and exit. --version Print version and exit. -q, --quiet Be quiet. -i, --interactive Open the interactive prompt which can be used to select the items. gcap selects all items by default. See also "INTERACTIVE PROMPT". -t, --title Parse video title and use it in the output filename(s) instead of video ID. The default is no. -r, --regexp=arg Cleanup video title using the specified arg regular expression. The default is "/(w|s)/g". --proxy arg Use arg for HTTP proxy, e.g. "http://foo:1234". Overrides the http_proxy environment setting. --no-proxy Disable use of HTTP proxy. Overrides both "--proxy" and http_proxy environment settings. INTERACTIVE PROMPT
Use the "--interactive" switch to open the prompt. Note that gcap uses (as of 0.1.0) the Umph::Prompt module for this. Once the prompt opens, type "help" to get a list of commands available to the prompt. EXAMPLES
gcap 0QRO3gKj3qw gcap "http://www.youtube.com/watch?v=0QRO3gKj3qw" Both yield the same results. gcap -ti 0QRO3gKj3qw Same as above two but use video title in the filename and choose which of the closed captions should be downloaded. EXIT STATUS
Exits 0 on success, otherwise 1. FILES
$HOME/.gcaprc, for example: echo "--interactive" >> ~/.gcaprc NOTES
Availability The following error message produced by gcap (or the XML::DOM module) typically indicates that the video does not have any closed captions available for it (URL omitted for brewity): Couldn't parsefile [...] with LWP: no element found at line 1, column 0, byte -1 at [...]/XML/Parser.pm [...] http_proxy gcap depends on XML::DOM which uses LWP::UserAgent to download the data. Note that LWP::UserAgent reads http_proxy environment setting. e.g.: env http_proxy=http://foo:1234 gcap video_id WWW
<http://gcap.googlecode.com/> <http://repo.or.cz/w/gcap.git> AUTHOR
Toni Gundogdu <legatvs at sign cpan org> perl v5.12.4 2011-11-15 GCAP.1(1p)
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