General :: Using Grep And Expressions?
Mar 28, 2010
How can I use grep expressions so that i can find strings like the ones bellow:
New York, NY
Virginia, VA
Oregon, OR
As you can see each city starts with capital letter then it follows up with a comma, and then with the Abbreviation of the city. I used :
Code: grep -w '[A-Z].*[a-z][,][' '][A-Z][A-Z]' filename But i get no results.
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Apr 16, 2010
I'm writing a program that works with text files, and I'm trying to create some filters with grep. I have various questions here, so I'll number them for clarity.
1) First of all, I'd like to know what wc -w is actually returning. The word count is less than what gedit is counting in Document Statistics, so obviously gedit is counting something (like newlines) that wc -w is not
2) Secondly, I was wondering if there was a way to grep x number of words. I'm looking for something like the -m option, but returning a certain number of words instead of lines. For example, to find the first 2000 words, do something like grep -someoption 2000 ".*" or using {1,2000}.
3) Finally, I'm trying to filter out headers and footers of a text file but having no luck. The text files are Project Gutenberg files, so they have standardized headers and footers. Here's an example: [URL]...
The header starts with "The Project Gutenberg EBook of" and ends with the line containing "START OF THIS PROJECT GUTENBERG EBOOK" The footers begin with: "End of the Project Gutenberg EBook of" My problem is, grep can find:
[Code]...
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Aug 3, 2011
I can't get this simple regular expression to work for matching emails: 'w*(?:.w*)*@w*(?:.w*)*w{2,5}'
It should be working as I have tested it with regex pal and it works just fine. I think there's a problem with optional character class but I'm not sure.
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Mar 20, 2011
how to use grep with an expression that is constantly changing... basically this is what I am trying to do:
Code: watch "mpstat -P ALL | grep -e '`date +%r`'" which, should show me my CPU usage updated every couple seconds. The grep is being used to omit lines that aren't needed (all the useful lines start with the current time.) Problem is, it seems to execute the 'date +%r' command once.
I would like grep to execute the date command every time the watch command updates.
EDIT: I've found a workaround by putting the
Code: mpstat -P ALL | grep -e "`date +%r`" All in a shell file (that I called cpustat.sh), and then executing watch ./cpustat.sh
Would still like to know if there is an actual solution without having to create a seperate file (and preferably in one line). I have tried using a function to do the mpstat and grep part, but apparently watch doesn't play nice with functions
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Jul 29, 2010
I am trying to learn more about global expressions and how it is needed in changing stuff in vi and in shell scipting in general.My question is basic:
How can I add a " # " pound sign at the beginning of every line in a file. So if I want to remark out every line in a file, what would be the global expression for that? Is there a global expression cheat sheet?
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Mar 13, 2010
I need to edit myfile in a script.I tried items below but it did not change anything.
myfile:
141 aaaa bb Jun 4'09su Jun15'09mo yyyy
206 vvv nn Jun 4'09su Jun16'09tu tt
208 bb yyyy Jun 4'09su Jun15'09mo vvvvvvvv
[Code].....
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May 5, 2010
I am pretty new at this topic but I would like to learn it from example. The first thing I am working on is to modify the command date to be shown as DD/MM/YY only using regular expression but I dont know how to combine what there is in the regexp tutorials online and the syntax for batch scripting. Any help?
Here is what I what.
run a file test: ~# ./test
Where file test is:
#!/bin/bash
#
DATE=$( date )
[Code]..
Also if you can point me to good regexp tutorials (directed towards batch scripting), that will be great.
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Aug 26, 2010
As the subject says, can anyone explain to me what is the difference between Regular Expressions and Globbing?
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Feb 23, 2010
How to make tools like sed operate on the whole file, instead of line-by-line?
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Nov 20, 2010
How can we do a simple match by regular expressions on two filenames. I plan to use it in the command 'find -regex'
Code:
hosts.txt
ipaddress.txt
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May 6, 2010
Lets say I have 20 files named FOOXX, where XX is the number of the file, eg 01, 02 etc. At the moment, if I want to delete all files lower than the number 10, this is easy and I just use a wildcard, eg rm FOO0* However, if I want to delete specific files ina range, eg 13-15, this becomes more difficult. rm FPP[13-15] does not work, and asks me if I wish to delete all files. Likewse rm FOO1[3-5] wishes to delete all files that begin with FOO1 So, what is the best way to delete ranges of files like this? I have tried with both bash and zsh, and I don't think they differ so much for such a basic task?
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Nov 22, 2010
I need to kind of grep within grep. My input file would be something like:
[Code]....
and I need to find the first occurrence of hello before MY PATTERN (hello 9008 in this case), so the output should be:
[Code]....
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Aug 15, 2010
I want to use regular expressions and sed to remove html tags from a text file.
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Apr 22, 2010
im trying to get sed to read through a txt document that contains html and cant get it to copy over my code looks like Code: sed -n '/[width=468 height=60 border=0 /></a></center><hr>]/,/[<br clear=left><hr>]/p' 1.txt > 2.txt This is the code that seemed to have the best chance of working but still all it does is copy the whole txt document over instead of between these 2 expressions
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Mar 29, 2010
how a way that I can edit the metadata tags on some MP3s using regex?
I've got almost 100 MP3, all named "01 - <song title>," "02 - <song title>," etc., and I, understandably, don't want to edit them all by hand.
Running "s/d{2} - //g" would be so much easier.
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Mar 26, 2011
I've began to develop with C++ (Eclipse+Qt) and the first problem I see is that there is not good functions for manipulating strings. if there is a library for manipulating strings with regular expressions?
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May 31, 2011
i am trying to create an exclude regular expression for my build.xml. The problem is, that i am trying to find some info on which REs are acceptable/valid for ant... Is ant using standard regular expressions? POSIX ones? Since it is a java-based tool, the "Java REs" are probably valid. I am a little bit confused. If somebody can help me out with the different RE standards, i would be most obliged.
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Feb 1, 2011
I've been loosely following this:http://norvig.com/lispy.htmlAnd I have a problem: the parsing function throws an array out of bounds exception. I thought that maybe I'm doing it wrong, so I copy and pasted the code from the page, and still the same error
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Jun 8, 2010
Using the regex.h functions, how do you:
1) get the matched strings?
2) get the strings that matched sub-expressions?
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Mar 17, 2010
Gidday, I'm puzzled as to why this works:
Code:
find /Data/ -type f -iname "*7pm*"
But this doesn't:
Code:
find /Data/ -type f -regex *7[Pp][Mm]*
I've tried MANY variations, but I'm getting no error messages, just no returns, and yet the first find, will find the sorts of files I'm looking for. I realise a win is a win, but I'm of the understanding that the -regex switch allows for some really complex use of regular expressions - but I can't even get a very simple one to work,
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Apr 7, 2011
I need to find file from ls - l by using grep and certain regexp.
In particular I need greep to see certain file ending, like let's say .txt but only using regex.
So it should be something like
ls -l | grep '^.+.txt$'
But that doesn't seem to work for me.
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Jan 12, 2010
The * would not have to be because it means everything [az] [0-9 ][$%&!"/()=?'=) but not how to solve[URL]..
ls [0-9a-zA-Z]*[@]*[gmail | yahoo | hotmail]*[.]*[com]
ls [0-9a-zA-Z][.-_][0-9a-zA-Z]*[@]*[gmail | yahoo | hotmail]*[.]*[com]
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Jan 14, 2011
Is there any software substitute for the Microsoft Expressions ? Recommendations ?
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Jun 8, 2010
How do I make Vim use extended regular expressions?
I really wish I wouldn't have to use all these ugly backslashes to do backreferences.
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Dec 21, 2010
I need to grep a dictionary file.Only the words that contain 2 or more z's and only 1 b needs to be listed.
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Jul 15, 2010
I am trying to grep for A records in a bind zone file but I am failing.I am trying: grep "s+As+" db.domain.comBut there are no results.
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Jul 29, 2010
Today, i checking my error log of Apache. I have look many IP brute scan URLo, i collect, export that to ip.txt and i need grep IP with connection >=8I don't know command to solve that. Example ip.txtQuote:
101 210.13.73.30
161 58.210.77.98
164 115.168.71.87
[code]....
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Feb 3, 2010
I have a file which contains a line like this:SERVER=10.205.110.19 How can I cut out the IP and assign it to a variable?
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Feb 19, 2011
I have on my desktop around five java files. I also created a java file in directory Viti, located in desktop.
Since all java files contain string "class", I practice my usage of grep with the following:
And this works fine. However, when I type the following:
I expect to be shown the file that's located in my Viti directory, too, but it won't show it.
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Jul 3, 2010
I searched and I found a few threads on this but none answered my question really.I'm using:
Code:
curl www.foo.com | grep '<h2>.*.</h2>'
Basically I want to extract all instances of
Code:
<h2>Blah blah blah</h2>
from the page source, but it's not giving me that, it gives me <h2>.. followed by a loads of other stuff that I don't want. I haven't used wildcards with grep before so I don't really know whether I'm doing it right or not.
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