Need help in string extraction using regular expressions


 
Thread Tools Search this Thread
Top Forums Shell Programming and Scripting Need help in string extraction using regular expressions
# 1  
Old 05-18-2009
Question Need help in string extraction using regular expressions

Hi, I am a new bee to this forum.

I am trying to extract the text after a matching pattern from a url using regular expression.

Ex:
Code:
http://locatlhost:2020/proxy/checkthisout

I want to extract the string after proxy/. I am not familiar with reg ex. Can someone please help?

Last edited by Franklin52; 05-18-2009 at 04:13 PM.. Reason: Replace url tags
# 2  
Old 05-25-2009
Quote:
I am a new bee ... I want to extract the string
Do you want to extract the string or the sting? Smilie

man sed

You probably want something like:
Code:
sed -n 's/.*http:\/\/localhost:3030\/proxy\///p'

# 3  
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
Login or Register to Ask a Question

Previous Thread | Next Thread

10 More Discussions You Might Find Interesting

1. Shell Programming and Scripting

Regular Expressions

Hi Ilove unix and alwyas trying to to learn unix,but i am weak in using regular expressions.can you please give me a littel brief discription that how can i understand them and how to use .your response could lead a great hand in my unix love. (1 Reply)
Discussion started by: manoj attri
1 Replies

2. Shell Programming and Scripting

Regular Expressions

what elements does " /^/ " match? I did the test which indicates that it matches single lowercase character like 'a','b' etc. and '1','2' etc. But I really confused with that. Because, "/^abc/" matches strings like "abcedf" or "abcddddee". So, what does caret ^ really mean? Any response... (2 Replies)
Discussion started by: DavidHe
2 Replies

3. Shell Programming and Scripting

Regular Expressions

#!/usr/bin/perl $word = "one last challenge"; if ( $word =~ /^(\w+).*\s(\w+)$/ ) { print "$1"; print "\n"; print "$2"; } The output shows that "$1" is with result one and "$2" is with result challenge. I am confused about how this pattern match expression works step by step. I... (8 Replies)
Discussion started by: DavidHe
8 Replies

4. UNIX for Dummies Questions & Answers

Regular expressions

In regular expressions with grep(or egrep), ^ works if we want something in starting of line..but what if we write ^^^ or ^ for pattern matching??..Hope u all r familiar with regular expressions for pattern matching.. (1 Reply)
Discussion started by: aadi_uni
1 Replies

5. Shell Programming and Scripting

Need help with Regular Expressions

Hi, In ksh, I am trying to compare folder names having -141- in it's name. e.g.: 4567-141-8098 should match this expression '*-141-*' but, -141-2354 should fail when compared with '*-141-*' simlarly, abc should fail when compared with '*-141-*' I tried multiple things but nevertheless,... (5 Replies)
Discussion started by: jidsh
5 Replies

6. Shell Programming and Scripting

How to extract text from string using regular expressions

Hi, I'm trying to use sed to extract some text and assign it to a variable. Can anyone provide me with some help? it would be much appreciated! I"m looking to extract for example: filename=/output/R34/2005_13_R34_C1042S_T83_CRFTXT_20081015.txt I'm trying to extract the 1042... (9 Replies)
Discussion started by: jtung
9 Replies

7. UNIX for Advanced & Expert Users

Regular Expressions

Hi, below is a piece of code written by my predecessor at work. I'm kind of a newbie and am trying to figure out all the regular expressions in this piece of code. It is really a tough time for me to figure out all the regular expressions. Please shed some light on the regular expressions... (3 Replies)
Discussion started by: ramky79
3 Replies

8. UNIX for Dummies Questions & Answers

regular expressions

how to find for a file whose name has all characters in uppercase after 'project'? I tried this: find . -name 'project**.pdf' ./projectABC.pdf ./projectABC123.pdf I want only ./projectABC.pdf What is the regular expression that correponds to "all characters are capital"? thanks (8 Replies)
Discussion started by: melanie_pfefer
8 Replies

9. Shell Programming and Scripting

regular expressions

Hello, Let say I have a string with content "Free 100%". How can extract only "100" using ksh? I would this machanism to work if instead of "100" there is any kind of combination of numbers(ex. "32", "1238", "1"). I want to get only the digits. I have written something like this: ... (4 Replies)
Discussion started by: whatever
4 Replies

10. Programming

regular expressions in c++

How do I use the regular expressions in c++? (2 Replies)
Discussion started by: szzz
2 Replies
Login or Register to Ask a Question