Regular expressions are a means of matching a pattern of characters within a string.
1
vote
1answer
34 views
Matching hexadecimals with gawk
I have a binary file with the following content (printed in hexadecimal):
$ xxd -p virus.com
5669727573b440bb0100b90500ba0000cd21
I can match the first 5 letters (which are the alphanumeric string ...
2
votes
2answers
41 views
rsync certain files, excluding the rest, ignoring .svn/ directory, recursively
I'm using rsync to copy some files from a share to another.
Recursively, I need to:
Delete files at destination that were removed from the origin
Only sync php and js files
Exclude every other file ...
2
votes
2answers
39 views
How to find files with a certain subpath?
I need to find all xml-files that are placed in folders named config. Also config must be somewhere under a folder named trunk. For example, I am interested in all files like below:
...
1
vote
2answers
256 views
How to find and replace files contents that match a pattern?
Suppose we have a folder named Project.
I would like find each file in the folder that contains the pattern &$
at the function call.
For example should replace:
AnyFunction(&$arg);
with
...
1
vote
2answers
34 views
Trimming one part if equal to another part?
I use an e-mail quote attribution string like this:
On dd mmm yyyy hh:mm +hhmm, from info@example.org (Example Dot Org):
where info@example.org is the sender's e-mail address and Example Dot Org is ...
0
votes
1answer
47 views
How to ask for specific parameters with grep?
I need to look in /usr/share/dict/words for a 5-letter word that starts with d or D, followed by a lowercase vowel, and ends with s. I have tried everything but to no avail.
1
vote
2answers
51 views
linux + match IP ADDRESS with 3 octets or with 4 octets
how to match IP address with 4 octets or with 3 octets in one command?
target - match xxx.xxx.xxx or xxx.xxx.xxx.xxx ( syntax should fit for Linux and Solaris )
how to merge the following commands ...
2
votes
2answers
216 views
Regular expressions with ExpectJ
I've been used the ExpectJ Java library to automate some jobs on a Linux server, however now I need to automate a job that sends a different text response for each execution. Here is the output:
Last ...
0
votes
2answers
72 views
bash - reading user variable into bash script grep
I've tried every possible combination to get this bash script working. It's part of a larger script, and it basically prompts for a username (to check if it exists) and returns the appropriate ...
23
votes
2answers
15k views
How can I find files with certain extensions
How can I use find to find all files that have a .xls or .csv extension? I have seen a -regex option but I don't know how to use it.
4
votes
3answers
94 views
Remove string from a particular field using awk/sed
I have a file (>80,000 lines) that looks likes this:
chr1 GTF2GFF chromosome 1 249213345 . . . ID=chr1;Name=chr1
chr1 GTF2GFF gene 11874 14408 . + . ...
5
votes
3answers
201 views
difference between .* and * in regular Expression
I've a file named "test" that contains
linux
Unixlinux
Linuxunix
it's linux
l...x
now when i use grep '\<l.*x\>' , it matches :
linux
it's linux
l...x
but when i use grep '\<l*x\>' ...
1
vote
3answers
88 views
Trying to remove all ids from an HTML file with grep
I'm trying to remove all id=" "s from an .html file but I'm not sure where I am going wrong. I tried using regular expressions but all I am getting is the .html file rendering in my Ubuntu terminal.
...
4
votes
2answers
89 views
remove duplicate files
On my Mac OS X 10.6.7, iTunes duplicated every single file in my music library. Now I have 3,840 files instead of 1,920. The problem is that iTunes didn't simply duplicate the whole folder, but each ...
1
vote
3answers
227 views
Find files in multiple folder names
I am trying to list all the files from dir1, dir2, dir3 and dir4 which might be anywhere in as a sub directory of my cwd using the find command. I tried the following with no success:
find . -type f ...
0
votes
1answer
36 views
(e)grep and atomic grouping [comprehension question]
I am trying to understand the correct use of »atomic grouping« a.k.a. »independent subexpressions« a.k.a. »non-backtracking subpattern« [this are the terms I found ...
0
votes
2answers
91 views
what is “an invisible whitespace character that takes up space”
One can look up Unicode Characters with Regular Expressions. On Jan Goyvaerts website I found a RegExp whose meaning I don't understand :
\p{Zs} or \p{Space_Separator}: a whitespace character that ...
0
votes
1answer
25 views
Comment the if statement and the matching endif keyword
In vim, I can find the matching if statement and prepend the appropriate comment symbol. (e.g. %s/.alarm./#\0/g), but then I am left with dangling endifs that I have to find manually. I could simplify ...
0
votes
1answer
31 views
How to highlight the whole log-line in color with multitail
I'm trying to use multitail to tail logs with color highlights. I defined a custom color scheme in multitail.conf, something like this:
colorscheme:my-color
cs_re:red:^\[E
cs_re:yellow:^\[W
...
0
votes
1answer
49 views
Regex awk to Cisco Interface
I would like to know if have some Sed/Grep or Awk regex to parse Cisco interface section, with specific attribute, like bellow.
Content of file.txt
!
interface FastEthernet0/1
no ip unreachables
!
...
4
votes
3answers
135 views
Delete XML node containing certain element
I want to remove all Placemarks from a KML file that contain the element <tessellate>. The following block should be wholly removed:
<Placemark>
...
3
votes
2answers
108 views
greedy and lazy regular expressions (comprehension question)
I am teaching myself regular expressions, and I got stuck at »greedy« vs. »lazy« repeatings.
What I found out so far is that
»greedy« means that the RegExp ...
1
vote
3answers
120 views
Why is this Bash command using regex not replacing my brackets?
I have this command to go through all my files in my Music directory, and all subdirectories, and replace any square brackets in the file name with rounded brackets:
find /home/Music/ -depth -name "* ...
1
vote
1answer
60 views
Confused about word boundary
I have been researching this a lot, but I am still not clear on it. What does word boundary mean? What does it do?
So, for example, could someone explain this command to me please?
egrep ...
0
votes
3answers
129 views
Regular Expression for finding double characters in Bash
I am looking for a regular expression that finds all occurences of double characters in a text, a listing, etc. on the command line (Bash).
Main Question: Is there a simple way to look for sequences ...
1
vote
2answers
133 views
Regular expression problem(s) in Bash: [^negate] doesn't seem to work
When I execute ls /directory | grep '[^term]' in Bash I get a regular listing, as if the grep command is ignored somehow. I tried the same thing with egrep, I tried to use it with double and single ...
3
votes
2answers
828 views
What regular expression engine type does bash use?
I use RegEx Buddy to prototype and debug my regular expressions. RegEx Buddy allows me to choose between a number of different regular expression engine types (.NET, Java, Perl, GNU BRE, GNU ERE, ...
1
vote
3answers
57 views
Check some property for every line of a file
I have several (427 to be precise) text files with a million lines each containing 31 numbers separated be spaces (possible double spaces). However there might be some data corruption and there may be ...
0
votes
3answers
58 views
regex suggestion
echo "223255/12345678 " | grep '[0-9a-zA-Z/\-\?:\(\)\.,"\+]{1,34}'
According to the regex, it can have any of 0-9 a-z A-Z / - ? : ( ) . , " + of upto 34 chars in any order. Am I ...
1
vote
2answers
83 views
Regex and piped commands with sed
I'm finding really hard to use sed command, plus I can't seem to find well written tutorials.
Let me say that I worked with regular expression in other languages (Python, JavaScript, Java), so that ...
1
vote
3answers
168 views
awk, sed, grep, perl… which to print out in this case?
I have this syntax in a file (http response times from analog):
<thead><tr><th class="x">seconds</th><th class="R">reqs</th><th ...
12
votes
9answers
1k views
There must be a better way to replace single newlines only?
I am in the habit of writing one line per sentence because I typically compile things to LaTex, or am writing in some other format where line breaks get ignored. I use a blank line to indicate the ...
1
vote
1answer
47 views
Regular expressions help
what the different between these two regex expression ?
AB\{4\} and (AB)\{4\}
for the first expression I think that it repeat B 4 times, then for second expression it
repeats AB 4 times. When I ...
0
votes
1answer
45 views
Help with understanding a regular expression
I have this regular expression \\..\\{3\\}$
I want to understand how this expression works to match a string. My thought is that it matches any 8 characters at the end of the line. Is that how this ...
3
votes
2answers
71 views
find command with regex {1,2}
I have been trying to create a find command string that will find all files that end with a number 1-99 but exclude all others.
e.g. I want to find myfile1 myfile99 but not myfile456 and not ...
5
votes
2answers
91 views
exact match in regrex when using vim, man, or less
when using vim, man, or less, I want to do some exact match in regrex
for example, when using man, I want to check the argument '-c'
if I use
/'-c'
the matching could be -cim ...
-1
votes
3answers
296 views
How to tell grep to match special character at beginning of each word [duplicate]
I have certain questions regarding grep.
Why does the following command match '<Hello'?
$ grep -E "\<H" test
Hello World
<Hello
H<ello
What needs to be done to match '<Hello' only?
...
2
votes
2answers
101 views
changing pattern by removing spaces?
file :
hi hello,new york, , ,brazil site ,brazil
january,month is feb , , ,indiana jones
task:
delete all horizontal space (spaces and tab) between any two comas (like , ,) if ...
1
vote
2answers
115 views
Match a simple Regex
I need to match this: (tt\d{1,10}) in a file with the file ending txt.
I have tried grep and ack-grep but without results.
ack-grep -G \.txt$ -g "(tt\d{1,10})"
1
vote
2answers
100 views
grep: invalid content of \{\}
Here's the command :
grep '\(2\)[[:digit:]]\{\1\}' numbers
What I want is to match exactly 2 digits after the digit '2', 3 digits if I change the digit '2' to '3' in my expression, 4 digits if ...
...
13
votes
3answers
436 views
What is the difference between [[ $a == z* ]] and [ $a == z* ]?
Is there is any difference between these two.
[[ $a == z* ]]
and
[ $a == z* ]
Can I have an example where they would have different outputs?
Furthermore, how does the working of [[ ]] differs ...
0
votes
2answers
161 views
Difference in regular expression handling between Perl, Kikki, and Kodos
#!/usr/bin/perl
$mystring = "[2004/04/13] The date of this article.";
if($mystring =~ m/(\d+)/) {
print "The first number is $1.";
}
Perl returns 2004, but Kiki and Kodos return /04/. Why ...
1
vote
3answers
119 views
Recursively edit files based on parent directory's name
I'm facing an issue I'm not quite sure how to overcome. I have a large directory with hundreds of folders, all following the naming scheme "a_b_x", with x being a random word. In every one of these ...
-1
votes
1answer
45 views
Doing regex in python [closed]
I had a directory "/pcap_test" which contains several log files. Each file has a pattern like:
Pkt: 1 (358 bytes), LIFE: 1, App: itunes (INTO), State: TERMINATED, Stack: /ETH/IP/UDP/itunes, Error: ...
0
votes
2answers
99 views
regex, only the first occurence
I have a pipelined output from free -o -m | awk '{print $4}' I want take step by step two numbers the first and the second line. So i need two regexes.
I tried with ^[0-9]{1,3}$ but this match all ...
3
votes
5answers
165 views
Regex match in CLI
Is there something like a logical for the cli? I want to achieve this
mv -t newfolder *.(png|jpg)
so that alls jpg and png files are moved into newfolder. I know it could be done with
mv -t ...
4
votes
2answers
166 views
Why does this add spaces? echo “x ax” | sed 's/x\s*/x /'
I want to find a x, and replace the 0 or more following spaces (\s*) with just a single space.
echo "x ax" | sed 's/x\s*/x /'
For some reason, instead of replacing the spaces with the single space, ...
1
vote
2answers
143 views
Pattern matching from the input arguments
we're trying to enhance the scripts.
Users will pass some arguments and part of the arguments will have 5.0.3 For an example the input argument would be like Jboss5.0.3GA. Since it ( Jboss5.0.3GA ) ...
6
votes
4answers
12k views
Finding text between two specific characters or strings
Say I have lines like this:
*[234]*
*[23]*
*[1453]*
where * represents any string (except a string of the form [number]). How can I parse these lines with a command line utility and extract the ...
4
votes
2answers
168 views
Regexp in .ssh/config
At work, I often have to log into hosts which follow a common naming scheme, e.g. qc01 - qc12, hc01 - hc10, and so on. All of these need to get the same config values in my laptop's .ssh/config. Of ...
