Login or Register to Ask a Question and Join Our Community

Sponsored Content
Full Discussion: Grep regex to ignore sequence only if surrounded by fwd-slashes
Top Forums Shell Programming and Scripting Grep regex to ignore sequence only if surrounded by fwd-slashes Post 302879277 by Chubler_XL on Wednesday 11th of December 2013 03:11:16 PM
Old 12-11-2013
Quote:
Originally Posted by gencon
My humblest apologies for taking your name in vain, and incorrectly stating that you were wrong when you wrote that "the code never uses the value of the array element" - clearly you were not wrong, it was me that was wrong and I'm currently feeling somewhat guilty. Smilie
No need to feel guilty I have a feeling I'm much better at solving problems than explaining what I mean, my wife says I the most left-brained person she knows.

On your RegEx performance testing.

I've done this sort of analysis myself in the past and have found little difference in the various flavours of RE.

However I did find catching lines in the pattern section (pattern { action }) with a well constructed RE instead of using logic in the action section gave significant performance improvements. Probably because you avoid all the overhead of splitting up the fields assigning NF and such.
This User Gave Thanks to Chubler_XL For This Post:
gencon
 

10 More Discussions You Might Find Interesting

1. Shell Programming and Scripting

To grep in sequence

Hi, I have a log file containg records in sequence <CRMSUB:MSIN=2200380,BSNBC=TELEPHON-7553&TS21-7716553&TS22-7716553,NDC=70,MSCAT=ORDINSUB,SUBRES=ONAOFPLM,ACCSUB=BSS,NUMTYP=SINGLE; <ENTROPRSERV:MSIN=226380,OPRSERV=OCSI-PPSMOC-ACT-DACT&TCSI-PPSMTC-ACT-DACT&UCSI-USSD;... (17 Replies)
Discussion started by: helplineinc
17 Replies

2. Fedora

Hosting issue regarding subdirectories and fwd Slashes

I admin two co-located servers. I built an app that creates subdirectories for users ie www.site.com/username. one server that works just fine when you hit that url, it sees the index within and does as it should. I moved the app to my other server running FEDORA 1 i686 standard, cPanel... (3 Replies)
Discussion started by: iecowboy
3 Replies

3. UNIX for Dummies Questions & Answers

| help | unix | grep (GNU grep) 2.5.1 | advanced regex syntax

Hello, I'm working on unix with grep (GNU grep) 2.5.1. I'm going through some of the newer regex syntax using Regular Expression Reference - Advanced Syntax a guide. ls -aLl /bin | grep "\(x\)" Which works, just highlights 'x' where ever, when ever. I'm trying to to get (?:) to work but... (4 Replies)
Discussion started by: MykC
4 Replies

4. Shell Programming and Scripting

ignore fields to check in grep

Hi, I have a pipe delimited file. I am checking for junk characters ( non printable characters and unicode values). I am using the following code grep '' file.txt But i want to ignore the name fields. For example field2 is firstname so i want to ignore if the junk characters occur... (4 Replies)
Discussion started by: ashwin3086
4 Replies

5. Shell Programming and Scripting

Grep but ignore first column

Hi, I need to perform a grep from a file, but ignore any results from the first column. For simplicity I have changed the actual data, but for arguments sake, I have a file that reads: MONACO Monaco ASMonaco MANUTD ManUtd ManchesterUnited NEWCAS NewcastleUnited NAC000 NAC ... (5 Replies)
Discussion started by: danhodges99
5 Replies

6. Shell Programming and Scripting

regex - start with a word but ignore that word

Hi Guys. I guess I have a very basic query but stuck with it :( I have a file in which I want to extract particular content. The content is between standard format like : Verify stats A=0 B=12 C=34 TEST Failed Now I want to extract data between "Verify stats" & "TEST Failed" but do... (6 Replies)
Discussion started by: ratneshnagori
6 Replies

7. Shell Programming and Scripting

Ignore escape sequence in sed

Friends, In the file i am having more then 100 lines like, File1 had the values like this: #Example East.server_01=EAST.SERVER_01 East.server_01=EAST.SERVER_01 West.server_01=WEST.SERVER_01 File2 had the values like this: #Example EAST.SERVER_01=http://yahoo.com... (3 Replies)
Discussion started by: jothi basu
3 Replies

8. Shell Programming and Scripting

Need sequence no in the grep output

Hi, How to achieve the displaying of sequence no while doing grep for an output. Ex., need the output like below with the serial no, but not the available line number in the file S.No Array Lun 1 AABC 7080 2 AABC 7081 3 AADD 8070 4 AADD 8071 5 ... (3 Replies)
Discussion started by: ksgnathan
3 Replies

9. Shell Programming and Scripting

Grep command to ignore line starting with hyphen

Hi, I want to read a file line by line and exclude the lines that are beginning with special characters. The below code is working fine except when the line starts with hyphen (-) in the file. for TEST in `cat $FILE | grep -E -v '#|/+' | awk '{FS=":"}NF > 0{print $1}'` do . . done How... (4 Replies)
Discussion started by: Srinraj Rao
4 Replies

10. Shell Programming and Scripting

Grep and ignore list from file

cat /tmp/i.txt '(ORA-28001|ORA-00100|ORA-28001|ORA-20026|ORA-20025|ORA-02291|ORA-01458|ORA-01017|ORA-1017|ORA-28000|ORA-06512|ORA-06512|Domestic Phone|ENCRYPTION)' grep -ia 'ORA-\{5\}:' Rep* |grep -iavE `cat /tmp/i.txt` grep: Unmatched ( or \( Please tell me why am i getting that (6 Replies)
Discussion started by: jhonnyrip
6 Replies

LEARN ABOUT OSX

set_color

set_color(1)							       fish							      set_color(1)

NAME

       set_color - set_color - set the terminal color

set_color - set the terminal color
   Synopsis
       set_color [-v --version] [-h --help] [-b --background COLOR] [COLOR]

   Description
       Change the foreground and/or background color of the terminal. COLOR is one of black, red, green, brown, yellow, blue, magenta, purple,
       cyan, white and normal.

       o -b, --background Set the background color

       o -c, --print-colors Prints a list of all valid color names

       o -h, --help Display help message and exit

       o -o, --bold Set bold or extra bright mode

       o -u, --underline Set underlined mode

       o -v, --version Display version and exit

       Calling set_color normal will set the terminal color to whatever is the default color of the terminal.

       Some terminals use the --bold escape sequence to switch to a brighter color set. On such terminals, set_color white will result in a grey
       font color, while set_color --bold white will result in a white font color.

       Not all terminal emulators support all these features. This is not a bug in set_color but a missing feature in the terminal emulator.

       set_color uses the terminfo database to look up how to change terminal colors on whatever terminal is in use. Some systems have old and
       incomplete terminfo databases, and may lack color information for terminals that support it. Download and install the latest version of
       ncurses and recompile fish against it in order to fix this issue.

Version 1.23.1							  Sun Jan 8 2012						      set_color(1)
All times are GMT -4. The time now is 07:13 AM.
Unix & Linux Forums Content Copyright 1993-2022. All Rights Reserved.
Privacy Policy