Programming :: Perl Only Matching Single-character Regex Patterns?

Jan 20, 2009

I'm having a small issue with regex matching in Perl. I'm pretty certain it's a simple fix, but it all looks correct to me...

If I run the following:


It prints out all the lines containing a 'P', as one would expect. But when the regex is


I get zero lines printed. It seems to match only single-character patterns.

The file I'm reading is: (It has the same effect whether I leave it with Windows linebreaks or convert them to unix).


View 3 Replies


Programming :: Perl Regex Matching HTML?

Mar 19, 2010

I'm trying to find out how to extract the string between the 2 <title> tags: <title>this is what i want</title>.I found lots of results but nothing I've tried works.. EG:$page =~ m/<title>($.)</title>/gism;

View 2 Replies View Related

Programming :: Perl Regex Not Matching Across Multiple Lines Despite Ms Flags / Fix It?

Aug 16, 2010

I have written a regular expression (tested in regexpal and regextester alpha something) with which I want to replace something like code...

but it only matches functions which occupy one line only, despite my tests showing multiple line matching in javascript testers online and using the m and s flags (which should make it multi line no?)

View 14 Replies View Related

Programming :: ! For Not Matching Bash Regex?

Jan 13, 2011

In a bash-script, only the case if a regular expression does not match is relevant.herefore I used the exclamation mark !. But where to place it?

These two work fine, but are they equivalent?
Code: if ! [[ $abc =~ $pattern ]]; then or
Code: if [[ ! $abc =~ $pattern ]]; then Where is the ! placed more correct?

View 2 Replies View Related

Programming :: Awk Character Position Matching?

Apr 22, 2011

I am trying to check if the 9th character in a file on each line is a v and if so, then print the first word. I've tried a number of variations and am stuck !If it's possible to also check if character position 1 begins with a s in the same awk, that would make it cleaner instead of using egrep.

egrep '^s' file | nawk '{virtual=substr($0,9,1); if ($virtual=="v") {printf "%s", $1}}'
nawk: illegal field $(e)
input record number 1
source line number 1

View 13 Replies View Related

Programming :: SQL Substring Matching A Character?

Apr 7, 2011

I have the following string:"My dog spot(page 1)". I want just "My dog spot". How do I do this in SQL Server?

View 2 Replies View Related

Programming :: Specific Regex Pattern In Perl?

Feb 23, 2011

I'm fairly new to Perl and regular expressions. I have a large collection of files with their file names in the following general format: string - another string with spaces (2004) [year].ext I would like to know how I could create a regex to separate out:

the first string
another string with spaces

If you know of a better way of doing it without regular expressions, I would be happy to hear that way too.

View 13 Replies View Related

Programming :: Insert A Variable Into A Regex In Perl?

Jan 17, 2010

I was wondering if you insert a variable into a regex in Perl, will the contents of the variable be expanded by the regex engine?

View 14 Replies View Related

Programming :: Perl - Regex With Array Elements?

Mar 13, 2011

I have .txt.gz files that store queries made on a browser, d my job is to analyze them.The information is stored in a xml-like style.Quote:

<keywords />


View 6 Replies View Related

Programming :: Include A String Variable In A Regex (Perl)

Jan 9, 2010

how do you include a string variable as part of a regex in Perl?

View 5 Replies View Related

Programming :: Use Perl Regex To Extract The Hostname From A FQDN?

Nov 19, 2010

How do i use perl regex to extract the hostname from a FQDN?

I have



i just want the characters which are to the left of the first .(dot) in FQDN name. I could get it using substr and split function,but how do i get it through regex.

View 13 Replies View Related

General :: How To Get List Of Files Not Matching Patterns In Bash

May 4, 2011

I have a file with joker character patterns:
From the current directory I would like to recursively get the list of files that do not match these patterns.

View 2 Replies View Related

Programming :: Use Regex In Perl Script To Detect Allowed Words From The File And Then Print Output To The Screen?

Oct 4, 2010

Its my first post in here so please be patient I am trying to use regex in perl script to detect allowed words from the file and then print output to the screen.

As an example : I have text file with orders and returns :


My question: is it possible to make sure that i am ony outputing to the screen orders based on few conditions like Item,order form e.g. online.And is it possible to have multiple matches (Item2 only diplay if ordered online etc)

View 1 Replies View Related

Programming :: Perl Regular Expression To Change Character

May 26, 2009

Part of a perl script I am writing need to change the character at an index to upper case. Now i am new to perl and i am having some trouble getting it to do it. In c++ i would do something like


Now from what i understand the same thing is possible in perl using regular expressions. But i cant get it to work.

View 2 Replies View Related

Programming :: HUGE Files - Compare A List Of Patterns From One File And Grep Them Against Another File And Print Out Only The Unique Patterns?

Aug 13, 2010

I am trying to compare a list of patterns from one file and grep them against another file and print out only the unique patterns. Unfortunately these files are so large that they have yet to run to completion. Here's the command that I used:

Code: grep -L -f file_one.txt file_two.txt > output.output Here's some example data:


how to increase efficiency or use another command?

View 14 Replies View Related

Programming :: Perl Match Character - Random Sentence Generator ?

Aug 11, 2010

I am trying to make a random sentence generator in perl. So far I can loop it x times to make a fixed quantity of words, but I don't want to do that. Or I can let it go on until I hit ctrl-C :/

I want to have it so that when it reaches a word with a sentence terminating punctuation mark it stops.

My attempt to do that was with:

This is doing the woooosh text until ctrl-C thing...

Now however I am not sure how I can cut off everything after the punctuation mark (when it exists).

View 1 Replies View Related

Ubuntu :: Text Manipulation - Regex - Pattern Matching?

Jul 12, 2010

Are there some good tutorials or reference materials on how do pattern matching and text manipulation in Linux?I have a few simple tasks I'd like taken care formatting numbers in file names, stripping some text from directory names, etc

View 2 Replies View Related

Ubuntu :: Bash - Delete First File Matching Regex?

Mar 27, 2011

In a bash shell script, I want to do something like this:

if [[ $(ls -ld /some/dir/foo_* | wc -l) -gt 4 ]]; then
rm -rf first_match_of /some/dir/foo_*


View 6 Replies View Related

Programming :: String Editing: Remove Lines Consisting Of A Single Character?

Jul 16, 2010

I have a large text file that's formatted sort of like this:

foo bar


View 2 Replies View Related

General :: Command Line - Print A Group Of Text Matching A Regex?

Sep 22, 2011

I'd like to print only few groups from text matching a regex. How can I do that in the Linux command line?

What other tools for text processing are there in Linux?

View 3 Replies View Related

Programming :: Script To Delete Aligned Single-character Columns With No Field Separator?

Apr 20, 2010

The lines beginning with greater-than symbols are the sequence descriptors and the lines immediately after each descriptor with A-Z characters, dashes, and question marks are the aligned DNA sequences. The sequences are always the same length within a file and never span/wrap across more than one line.I am trying to write a script to remove positions in the sequences that are only represented by a -, X, ?, or N (these represent gaps or missing data). Also, if there is exactly one non-gap/missing character in a position it is also useless (there is nothing to compare it to) so I would like to remove those positions as well.

Position 5 (from the left) was removed because it was all gap/missing characters. Position 9 was removed because only one character was a non-gap/missing character. Position 10 was retained because there were 2 non-gap/missing characters.I'm really not sure where to start here. My first concern is I can't figure out how to tell awk to treat each character in lines not containing a greater-than symbol as a separate field. After that, I'm thinking I should use set up a counter to count the number of lines with gap/missing characters comparing that to the total number of lines not containing greater-than signs?

View 14 Replies View Related

Ubuntu :: Regex In Grep - Match With Any Character Combination

Dec 10, 2010

regex in grep? I need to match ANYTHING in the following with any character combination (something like * in findstr in C): grep "Delivery of nonspam" /var/log/mail.log | grep "to [URL]"

View 1 Replies View Related

Programming :: Matching Two Tables Of Non-matching Sizes?

Mar 2, 2011

I have two table files with x (1st column) ,y (2nd column) coordinates and intensity (3rd column). I need to match these two tables and divide the intensities at the consecutive coordinates on the 3rd column. The problem is the size of the tables are not same and I want to ignore the lines if they are not in one of the other file.

Here is Table 1:


View 3 Replies View Related

General :: Expressing A Specific Range With Regex And Perl Extractors?

Feb 27, 2010

I am tryng to get values BBA 204- BBA 324 from a log file.

this is my script:

zmore log.gz | perl -nle 'print for m/BBAs[2|3][0-9][0-4]/g' | sort -u | perl -ne 'print if /^BBAs204$/../^BBAs324$/'

the first perl one liner gives me everything from BBA 200 to BBA 394, and the second perl one liner cuts it down to BBA 204 to BBA 324

Is there a elegant regex that will allow me to skip the second perl one liner and just take out the BBA 204 - BBA 324

View 2 Replies View Related

Programming :: Perl - Save An E-mail Attachment On Disk Keeping The "&" Character - No "%26"

Feb 25, 2010

I'm working on a Perl script that handles e-mails and attachments using MIME::Tools.

This script saves the attachments on filesystem, but whenever it finds an "&" (ampersand) into the filename (the filename is given by the "path" method of the "MIME::Body" class), it is changed into "%26" and then stored on disk.

To make an example, if an attachment is named "You & me.pdf", it is saved on disk as "You %26 me.pdf".

I also tried to change that char with a regexp and setting again the path passing the new (and working) value as a parameter to the "path" method, and if I print the value it is right, but on the filesystem is *always* stored with the "%26" string.

View 5 Replies View Related

Programming :: Grep The Patterns From The File?

Aug 10, 2010

I am interested in using the grep method in the shell of my CentOS machine to obtain patterns from a file and use them to search through another file and highlight the patterns found. For example:

pattern file:


test file:


View 8 Replies View Related

Programming :: Sed - Delete Blank Lines Between Two Patterns?

Jul 28, 2010

I am trying to delete any blank lines within two patterns e.g.

Address: 53 HIGH STREET Cred Id :
MM12 6MM
Pay Method : Crossed Cheque

The start of my pattern is "Cred Id" and the end is "Pay Method" and I want to delete the blank lines between county and post code. I did find the code below but it doesn't seem to change anything:

sed -ne '/Cred Id/,/Pay Method/!bp' -e '/^$/b' -e -e p ll.out

I can get it to print just the range I'm interested in by doing sed -ne '/Cred Id/,/Pay Method/p'.

View 5 Replies View Related

Red Hat :: Backspace Key Deletes Section Not Single Character

Jun 24, 2010

I am running RHEL 5 and when I get the backspace key it deletes a section to the left (such as /usr/localbin) instead of just a single character to the left. How do I change that?So it deletes the section instead of just the single character n.

View 4 Replies View Related

General :: Replacing Single Quotes In Filenames With Another Character

Jan 26, 2011

Can anyone offer a code snippet to recursively go through directories and replace any single or double quotes quotes found in a filename with another character (e.g. "_").If any of the filenames contain a single quote or double quote, then replace it with an underscore.

View 7 Replies View Related

General :: Vim To Input A Single Character And Continue In Command Mode

Jun 23, 2011

I increase my knowledge in vim in two ways. Little hints about doing this or that and scattered studies using the vim help files. Please do not believe I always rely on the first one.

View 12 Replies View Related

Copyrights 2005-15, All rights reserved