Login or Register to Ask a Question and Join Our Community


Shell Programming and Scripting

Help with grep / regular expression

Login to Discuss or Reply to this Discussion in Our Community

 
Thread Tools Search this Thread
Top Forums Shell Programming and Scripting Help with grep / regular expression
# 1  
Old 09-10-2010
MySQL Help with grep / regular expression
Hi,

Input file:
Code:
-13-
-1er-
-1xyz1-
-1xz12-
-2ab1-
-2ab2--
-143-

Code:
Code:
grep '^[\-][0-9][a-z]*[0-9]\-' input.txt

Wrong output:
Code:
-13-
-1xyz1-
-2ab1-
-2ab2--

Expected output:
Code:
-1xyz1-
-2ab1-

This is what i am trying to do:
1)starts with - as first one
2) second character any number
3) third one any letter a to z
4) penultimate char - any number
5) last one is with -

Thanks in advance . Smilie
# 2  
Old 09-10-2010
Hi.

Your description could be considered slightly ambiguous, but:

Code:
$ egrep '^-[0-9][a-z]+[0-9]-$' file1
-1xyz1-
-2ab1-

This User Gave Thanks to Scott For This Post:
dragon.1431
# 3  
Old 09-10-2010
Hi Scottn,
just curious, is it not possible to do it with grep / awk ?
# 4  
Old 09-10-2010
He is using grep, ie. egrep is like grep -E.
# 5  
Old 09-10-2010
And the awk is the same:

Code:
$ awk '/^-[0-9][a-z]+[0-9]-$/' file1
-1xyz1-
-2ab1-

Login or Register to Ask a Question

Previous Thread | Next Thread

10 More Discussions You Might Find Interesting

1. UNIX for Beginners Questions & Answers

Grep regular expression

I want to track only below: I am using below, but it doesn't work: (6 Replies)
Discussion started by: proactiveaditya
6 Replies

2. Shell Programming and Scripting

Grep + Regular expression or

Hi , I have few lines like A20120101.ANU.ZIP A20120401.ABC.ZIP A20120105.KJK.ZIP A20120809.JUG.ZIP A20120101.MAT.ZIP B20120301.ANU.XIP I want to filter by 1. Files starting with A and Ending With Z ( ^A.*.ZIP$) 2. And either ANU, or KJK or MAT in the file name. Hope my... (6 Replies)
Discussion started by: Anupam_Halder
6 Replies

3. UNIX for Dummies Questions & Answers

grep with variable and regular expression

i have a command line like this in csh script grep -i "$argv$" which i wanted to select the line ending with string provided as argument but it couldn't interpret the '$' (ending with).. any help? (3 Replies)
Discussion started by: ymc1g11
3 Replies

4. Programming

Perl: How to read from a file, do regular expression and then replace the found regular expression

Hi all, How am I read a file, find the match regular expression and overwrite to the same files. open DESTINATION_FILE, "<tmptravl.dat" or die "tmptravl.dat"; open NEW_DESTINATION_FILE, ">new_tmptravl.dat" or die "new_tmptravl.dat"; while (<DESTINATION_FILE>) { # print... (1 Reply)
Discussion started by: jessy83
1 Replies

5. Shell Programming and Scripting

grep and regular expression

Hi, I am executing a svnlook command to check to see if the following line exists. I need a regular expression to represent the line. A /test/test1/qa/test2/index.html A /test/test1/qa/test3/test.jpg A /test/test1/qa/test3/test1.jpg A /test/test1/qa/test4/test.swf I just need to extract... (9 Replies)
Discussion started by: kminkeller
9 Replies

6. UNIX for Dummies Questions & Answers

Help | unix | grep | regular expression

I have the following code: ls -al /bin | tr -s ' ' | grep 'x' ls -al: Lists all the files in a given director such as /bin tr -s ' ': removes additional spaces between characters so that there is only one space grep 'x': match all "x" characters that are followed by a whitespace. I was... (3 Replies)
Discussion started by: MykC
3 Replies

7. Shell Programming and Scripting

grep regular expression

please can someone tell me what the following regrex means grep "^aa*$" <file> I thought this would match any word beginning with aa and ending with $, but it doesnt. Thanks in advance Calypso (7 Replies)
Discussion started by: Calypso
7 Replies

8. Shell Programming and Scripting

grep with regular expression

Hi, guys. I have one question, hope somebody can give me a hand I have a file called passwd, the contents of it arebelow: *********************** ... goldsimj:x:5008:200: goldsij2:x:5009:200: whitej:x:5010:201: brownj:x:5011:202: goldsij3:x:5012:204: greyp:x:5013:203: ...... (6 Replies)
Discussion started by: daikeyang
6 Replies

9. UNIX for Advanced & Expert Users

regarding grep regular expression

When i do ls -ld RT_BP* i am getting the following list. drwxrwx--- 2 user group 256 Oct 17 10:09 RT_BP809 drwxrwx--- 2user group 256 Oct 17 10:09 RT_BP809.O drwxrwx--- 2 user group 256 Oct 17 10:09 RT_BP810 drwxrwx--- 2user group 256 Oct... (2 Replies)
Discussion started by: ukatru
2 Replies

10. Shell Programming and Scripting

grep : regular expression

guys, my requirment goes like this: I have a file, and wish to filter out records where 1. The first letter is o or O and 2. The next 4 following letter should not be ther I do not wish to use pipe and wish to do it in one shot. The best expression I came up with is: grep ^*... (10 Replies)
Discussion started by: RishiPahuja
10 Replies
Login or Register to Ask a Question