General :: Regular Expression To Match Unspecified Number Of Characters Until A '>'?

Jul 7, 2010

I'm attempting to search through a rather large assortment of html files created in Word using 'save as html'. what I'm trying to do is find and delete these tags (they're causing browsers to display black diamonds with white question marks):

<span style='mso-spacerun:yes'> </span> Tags contain from 1 to 4 spaces between opening and closing. I get positive results from this:

grep <span style='mso-spacerun:yes'> filename.html but once I attempt to tell it to match any number of characters up until the next '>' symbol, it tells me I'm using an invalid regex: grep <span style='mso-spacerun:yes'>[^>]+> filename.html

I've been nose-deep in regex tutorials for the past day or so, and I'm still not understanding why this doesn't work. If I put the pattern (without backslashes) into a separate file and use `grep -f patternfile filename.html`, I get no error but no matches either. So far as I can figure, the above regex boils down to:
Match the string "<span style='mso-spacerun:yes'>", followed by any number of characters that are not a ">", followed by a ">". If someone could tell me where I'm going wrong with this,

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General :: Regular Expression For Mod Rewrite - Match Directories Ape/ And Apes/

Dec 13, 2010

I have this..

RewriteRule ^(apes|ape)/(.*)$ $2?fh=$1 [L,QSA]

I only want to match the directories ape/ and apes/ but I think it is matching any directory that ends in "ape" or "apes" or maybe does it match any string containing those characters in any order? I am not great at regex, and have read alot, but still not sure if I understand this correctly.

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General :: Regular Expression To Grep For A N Digit Number?

Nov 23, 2010

I just want to grep for a n digit number followed by M alphabet. Generally for a three digit number i can give grep [0-9][0-9][0-9]M , but if the digits are increasing it is tough to represent them.

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Programming :: Sed Regular Expression Match Everything Up To A Certain Character

May 27, 2009

I need to use sed to edit a file that contains just one line. This should be pretty simple, but I've googled and can't seem to figure it out. I need to match everything from a certain string up until the first comma in the line. There are multiple commas in the line and my matching pattern is matching up until the last comma, not the first.

Here is what I'm trying:

As you can see it is matching up until the last comma. Seems like the .* is matching any character including the other commas. The output from this that I am hoping to achieve:

How can I get the regular expression to match from asdf: up until the first comma?

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Programming :: Regular Expression To Match URL Matches Fragments - Python?

Aug 26, 2010

I have made this:


from urllib import urlopen import re

current_site = urlopen("").read()
search = re.findall("((http://|https://|ftp://)|(www.))+(([a-zA-Z0-9.-]+.[a-zA-Z]{2,4})|([0-9]{1,3}.[0-9]{1,3}.[0-9]{1,3}.[0-9]{1,3}))(/[a-zA-Z0-9%:/-_?.'~]*)?", current_site)


I only want to match complete URL's. how do i avoid matching the fragments ?

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Programming :: Regular Expression To Match Lines In A File That Do Not Start With # Or A Blank Space?

Dec 25, 2010

i have a file like this

# comments
bla bla


i want to grep lines which do not start with # or a blank space. like

bla bla
bla bla

how do i do this? i tried grep --invert-match '^#' which gives lines not starting with # but gives me blank lines too i tried grep --invert-match '^#|^ ' which will give lines not starting with # OR not starting with blank ( which means any line including ones starting with #

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General :: How To Use Regular Expression In Grep

Jan 21, 2010

On my server, logs are saved in log.gz format. I want to know what regular expression should i use to search both oracle and a particular IP, say in a single log line ?

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General :: Regular Expression In VIM Search And Replace?

Oct 22, 2009

I have two type of lines in a text file example



I want to search and replace the second type of line with the first type i.e. with YAHOO included, so that I have



I am trying to use



In the above code ^<YAHOO> search is not working (I want lines "except YAHOO"). I know that [^ab] will work for "except a,b" characters. How can I say "except word" in regular expressions?

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General :: Building A Regular Expression For Use In Split Function?

Apr 1, 2011

so I have a perl script that contains an array like this:@hostNames = (ABC123R:, CBA321CBP:, ZYX987R:, etc firstelement"ABC123R:":ABC123R is the hostname and is it's IPaddress.I am trying to write a regular expression that will split the element with a '-' wherever there is a LETTER next to a NUMBER, like so:ABC-123-R: tried this expression below but am struggling with using regex for slightly complicated matching criteria:

for ($x = 0; $x < scalar(@hostNames); $x++)
$hostNames[$x] = split /([A-Z][0-9])/, "-"


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General :: Ignore Case Only For Part Of Regular Expression

Feb 15, 2010

What I want to achieve is, if I have following in my file:
x y
X z
I should be able to find the pair, x Y and replace it with x a. So, basically I want to search for case sensitive 'x' but search and replace case insensitive 'y'. How should I do it? Can this be achieved with 'sed' command?

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General :: Grep - Searching For Class References In C++ Using Regular Expression?

May 28, 2010

I'm trying to math all class references in a C++ file using grep with regular expression. I'm trying to know if a specific include is usuless or not, so I have to know if there is a refence in cpp. I wrote this RE that searches for a reference from class ABCZ, but unfortunately it isn't working as I espected:

grep -E '^[^(/*)(//)].*[^a-zA-Z]ABCZ[]*[*(<:;,{& ]'

^[^(/*)(//)] don't math comments in the begging of the line ( // or /* )
.* followed by any character
[^a-zA-Z] do not accept any caracter before the one I'm searching (like defABCZ)
[]* any white space (I can have something like ABCZ var; )
[*(<:;,{& ] followed by ( * < : ; , & { (I cant get #define "ABCZ.h" or ABCZdef for example)

Well, I can get patterns like this:

class Test: public ABCZ{
class Test: public ABCZ {
class Test : public ABCZ<T>


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General :: Regular Expression Search And Replace In Writer Or Gedit?

Oct 26, 2009

I've got a list of files that I've copied from my terminal and pasted into gedit and into OO.o writer. Since the files are all created by gedit, in each case there is both file and file~. I want to get rid of all the 'file~' lines. I thought I could do search and replace using *~, but this doesn't work.

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General :: Sed - Match Even Characters Only?

Sep 3, 2010

Say I had a string like so

Let's say I only wanted to grab TAC and BDX the ones in the 2nd, 4th, and 6th spot.

Will grab the lines from the rest of the file assuming these are the only lines with capital letters at the very beginning of each line.

Will delete the first 'T'. What I want to do is learn how to just pick the even characters, T(T)A(A)C(C) & B(B)D(D)X(X).

Is there something like the {1} which can pick just the even or odd character matches?

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General :: Regular Expressions Match 2 File Names?

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'


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General :: Grep Regular Expression To Find Any Two Capital Letters Side By Side?

Jan 8, 2011

How would I use a unix grep regular expression to find any two capital letters side by side and how would I find an expected comma in an expected spot?

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Programming :: Regular Expression {x} Doesn't Work?

Sep 2, 2010

I am trying myself on regular expressions. A read on [URL]/regex.htm) that {x} means search X times preceding character. So, why is this :

wstation~> echo '123456789' | grep [0-9][0-9][0-9]
123456789 # MATCH !! I have 3 numbers in a row.


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Programming :: Extract A Substring Using Regular Expression With SED

May 7, 2011

I've spent most of the evening browsing the web, trying many things I've found on various forums, but nothing seems to work.

I have a test.txt file containing many lines like the following ones :

<insert_random_text>228.00 €<insert_more_random_text>
<insert_random_text>17.50 €<insert_more_random_text>
<insert_random_text>1238.13 €<insert_more_random_text>

And I want to extract :


There is always one occurrence of € in each line. I want the numeric value that precedes this € occurrence. The random text (before and after) may contain numbers too, so the € may be important to parse, in order to correctly identify the number to return. The last character that precedes the number to extract is always a ">" (coming from an HTML tag).

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Programming :: Python Replace() With Regular Expression?

Mar 16, 2011

i cant use regular expression in replace function. I want to do this

a = ' Bad boy'
b = a.replace("b[aA]d", '')

Ofcourse this is a simple example for my query. Its not working so shall i assume regex dont work with replace function ?

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Programming :: AWK: Compare Apache Dates Without Using Regular Expression

May 15, 2010

I'm writing a loganalysis application and wanted to grab apache log records between two certain dates. Assume that a date is formated as such: 22/Dec/2009:00:19 (day/month/year:hour:minute) Currently, I'm using a regular expression to replace the month name with its numeric value, remove the separators, so the above date is converted to: 221220090019 making a date comparison trivial.. but.. Running a regex on each record for large files, say, one containing a quarter million records, is extremely costly.. is there any other method not involving regex substitution? here's the function doing the convertion/comparison


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Programming :: Use A Regular Expression In Parantheses Like ([/+[]()]) To Get The Specific Letters?

May 3, 2010

I found such simple example of awk

awk '
BEGIN { a = "1abc 2def"
b = gensub(/(.+) (.+)/, "\2 \1", "g", a)
print b }'

However I don't understand why the regular expresion in parentheses doesn't work how I woud expect. If I delete the .+ so it does the same.

awk '
BEGIN { a = "1abc 2def"
b = gensub(/() ()/, "\2 \1", "g", a)
print b }'

I wanted to use a regular expression in parantheses like ([/+[]()]) to get the specific letters.

awk '
BEGIN { a = "1abc 2def"
b = gensub(/([/+[]()])/, "//\1", "g", a)
print b }'

But why the regexp in () isn't working

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Programming :: Awk - Substitution With Parts Of Matched Regular Expression Used?

Apr 30, 2011

I remember reading that using sed, you can do this with parentheses: s/abc(something)def/(something)else/g I can't find an explanation of how to do something like this with Awk. Say you have this in an HTML file, where (number) stands for a one or two-digit number:


And you want to change that to this:

<a name="(number)t" href="#(number)b"><sup>(number)</sup></a>

How would this be possible? Would you have to use sed?

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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.

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Programming :: Regular Expression Double Escape For Files That End With .la ?

Mar 18, 2010

I have been battling with regular expressions and am a little lost. I want to find all my files that end with .la and have been trying this

slocate -r .la$

which finds them but also files like mozilla. The escaped full stop seems to be ignored however this works :

slocate -r \.la$

so why is the double escaping needed ?

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Programming :: String Comparison - Get Regular Expression To Work In If / Else Statement?

Jun 29, 2010

how do I get this regular expression to work in an if/else statement? This is just a little script for learning BASH. don't be too harsh.

This script will test if a certain number of files with 1-4 in their filename exist and print their filename. An error message will be printed if not.

for i in `ls file[1-9]`
if [[ "$i" == *1-4 ]] ; then
echo "This file, $i, ends in a number between 1-4"
echo "Error, this file, $i, does not end with a number between 1-4"

I get this error. ./ 13: [[: not found

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Programming :: Perl Scripting: Search For Regular Expression Not Work?

Oct 13, 2010

I'm writing a Perl script to find an old key in a file and replace it with a new codefirst the program should find the old key in the input file. here is the way I used in my script. but it doesn't work.May you please let me know what is wrong and how I can correct it?the key is stored in the file in the following format:

PHP Code:
I want 1234567


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Programming :: Regular Expression Doesnt Work In An Elsif Statement?

Feb 3, 2010

I was doing an exercise on Learning Perl, 3rd edition. (exercise chapter 10 btw) The problem asks to create a program that generates a random number and asks the user to guess. It should tell the user if the guess is lower or higher and exit if the user types either exit or quit. My code is the following:

#! /usr/bin/perl
$correct = int(1+rand 100);


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Programming :: Regular Expression Compile Failed - Throwing Error

Feb 15, 2011

The following command would remove the leading astericks, spaces, slashes, tabs and is present in an awk script.

gsub(/^[/* ]*/,"")

The above code is working fine when i run in Cygwin on windows machine. But when i run in Ubuntum throws the following error.

awk: ./Format.awk: line 30: regular expression compile failed (bad class -- [], [^] or [)
awk: 30: unexpected character ''
awk: ./Format.awk: line 30: runaway regular expression /,""); ...

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Programming :: Regular Expression Working Fine In JavaScript But Not In Python?

Jun 22, 2010

I have this regular expression


(@description ").*(";)

I want to match anything in between the quotes its working fine in JavaScript but its not working in my python program:


# -*- coding: iso-8859-1 -*-
import re


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Programming :: Tcl Expect - Unable To Use Regular Expression In Interact Mode

Dec 8, 2010

I have something like the following in my expect script:


interact {
-nobuffer -re {^s
} {


I have put the "^" anchor to match only those pattern that does not have anything before "s" e.g.

1.when I type "s" followed by "enter" key it should match.

2.if I type something like "chess" followed by "enter" key it shouldn't match. the second case is also being matched by the regular expression I have in my code.

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Programming :: Javascript Many Characters As Reg Expression Replace?

Jan 2, 2010

I'm working with javascript and trying to replace all instances of a Roman character in a string with nothing. How do I assign var reg to all Roman characters? In UTF8, capital letter A is U0041 and at the other end, small z is UFF5A.

So, I'd like to do something like:
var reg = u0041 - UFF5A;
str1 = str.replace(reg, '');

I think you get the idea. I have no idea if that can be done. The idea is to take this string (for example): str = make a door-to-door[house-to-house] visit / ring every doorbell." And take out all the Roman characters and define it as str1. And then take out all the Korean characters (u1100-uFFDC) and define it as str2. In fact, a WAY more useful thing to do would be to replace the instance of this: [u1100-uFFDC]+" "+[u0041-UFF5A] with [u1100-uFFDC]+","+[u0041-UFF5A] so that the output would be a .csv file.

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