Questions tagged [regular-expression]
Regular expressions are a means of matching a pattern of characters within a string.
0
votes
2answers
23 views
Can't run parallel zgrep with regex
When I run this:
find . -name "my.log*.gz" -print | \
parallel zgrep -e "\(text1\|text2\).*Exception"
to find all lines that match /(text1|text2).*Exception/ in all files in the folder, I get this ...
4
votes
3answers
321 views
How do I search a file using “less” for a value with a decimal point?
So I less my file:
less myFile.log
Then I try to search for a value:
/70.5
I've since learned less uses regex, so . is a wildcard. I've tried to escape it with no success.
0
votes
0answers
32 views
Why does fail2ban not trigger my custom filter?
fail2ban-regex verified that my filter matches Jan 14 07:39:41 myhost01 sshd[26433]: Connection closed by authenticating user root 127.0.0.1 port 56216 [preauth] 68 times inside auth.log, but fail2ban-...
0
votes
3answers
54 views
How to grep a line who has execution time greater than X
I have this line in my log
invokeSuperLambda execution time:xxs
Where xx is the time of execution and s is a static letter
When I run this on my log file
grep -a "invokeSuperLambda execution ...
2
votes
2answers
54 views
Having trouble parsing a csv file from the commandline
I have a CSV file that I've been working on for most of the day and I'm not having any luck getting it parsed properly using a Regex with awk.
awk is not processing the Regex as expected.
Here are ...
0
votes
1answer
26 views
Merging PDF files with similar names
I have a folder populated with PDF files in this format:
SI-T-xxxxxx.pdf
SI-T-xxxxxx-sol.pdf
SI-T-yyyyyy.pdf
SI-T-yyyyyy-sol.pdf
and so forth, with the middle part being digits.
I want a way for ...
0
votes
3answers
43 views
Linux sed command replace two lines having spaces and special characters using regular expression
I have one file having following example text.
"list-value": {
"object-value": {
"value": "example-value-123"
}
}
I want to change value text "example-value-123" by matching pattern ...
3
votes
4answers
195 views
Replace a string in a file preceeded by another string
I have a bunch of config files looking as follows:
reader_0 = newcamd({
name = "Oct 1",
host = "hostname 1",
port = 27020,
user = "UNAME",
pass = "password1",
key = "0102030405060708091011121314",
})...
1
vote
1answer
14 views
Why might re.search process these patterns differently?
I regularly use sagetex, which is written in python.
One of the scripts in the package defines a variable like this:
ignore = r"^( _st_.goboom|print 'SageT| ?_st_.current_tex_line)"
The script ...
0
votes
3answers
29 views
using awk to modify field with condition
INPUT
New,9,1
Old,11,0
OUTPUT
New,09,1
Old,11,0
I would like to append to filed number 2 after first , in case if it's single digit so i would like to add 0 before the digit as the output shown.
...
2
votes
1answer
41 views
How can I grep for empty functions?
I'm recursively looking in a directory for all functions containing only a blank one-line comment, such as the following:
public function index()
{
//
}
I tried grep -PR "//$" * with no luck.
1
vote
1answer
43 views
Using sed to replace the hexadecimal code for URL and to insert new SVG codes after SVG tag in all SVG files
I would like to ...
replace the hexadecimal code for URL (id) in all SVG files
insert/add the new lines of SVG codes after <svg ...>, using Regex.
Input:
<svg xmlns="http://www.w3.org/...
0
votes
2answers
36 views
delete pattern at least 5 numbers non consecutive
I have a file with about 7 million passwords with mixed Lower Upper digits
all have the same length 8 symbols
I want to remove the passwords than contain 5 or more digits not necessary consecutive:...
1
vote
3answers
54 views
Nailing down vim regex substitution
I started using Vimwiki to document weekly progress on my projects last year. As the year rolled on, the format of my list of links to weekly wikis changed a bit. At the end of the year I decided to ...
0
votes
3answers
37 views
Match file names with prefix, few digits and a suffix regex
How do I match file names abc_NNN.xyz? here is the directory content
[root@ tmp]# ls -ltr
total 0
-rw-r--r--. 1 root root 0 Jan 3 00:42 abc_123.xyz
-rw-r--r--. 1 root root 0 Jan 3 00:42 abc_234.xyz
...
2
votes
1answer
44 views
Look for multiple line string from bash
I am currently working with Jupyter notebooks. With an IDE I used to be able to look for parts of my code that could be elsewhere, and thus refactor as needed.
Suppose I have the following code:
...
3
votes
2answers
49 views
Bash - replace spaces with underscore but replace multiple spaces with one
I use rename to underscore spaces in filenames, simply with:
rename "s/ /_/g" *
but I encounter the problem that files downloaded from the internet often have multiple spaces. A nasty workaround I ...
2
votes
1answer
50 views
Use regex for file matching, not string matching
I'm trying to figure out how to use grep to search for for a specific string, (for the sake of simplicity) say "9", and I want to search for this, again for simplicity, on all files containing the ...
0
votes
2answers
42 views
awk: Insert line after comments and imports in source file
I have bunch of source files with very usual structure: some comments in header, some (optional) imports, and then source code, e.g.:
//
// AppDelegate.swift
// settings
//
// Created by Mikhail ...
1
vote
1answer
48 views
How to detect dot (.), underscore(_) and dash(-) in regex [closed]
I need to process information dealing with IP address or folders containing information about an IP host.
I need a pattern that can identify (match) IP addresses, whether an actual url, name of ...
1
vote
1answer
36 views
Hex code for '(' in bash regex
I have a strange behaviour in shell.
When I try to match '_' in regex with its hex code it works, but not with '('.
$ regex1=$'\x5f'
$ pattern1='_'
$ if [[ $pattern1 =~ $regex1 ]]; then echo yes; ...
1
vote
1answer
72 views
Match ASCII codes in shell regex
I've trouble about matching ASCII codes in regex in my bash script.
My payload is : payload='#1243669, start 2018-12-17 16:32:50 CET'
My old regex is : regold='(#[^,]+),'
My new regex is : regnew='(#...
1
vote
1answer
28 views
mosquitto bruteforce fail2ban failregex
I am trying to write fail2ban filter to block bruteforcing IP addresses which are trying to subscribe to username/password protected mosquitto service by guessing username/password combinations.
On ...
0
votes
2answers
56 views
Why regular expression '[a-z][0-9]+$' not work
I use the regular expression to handle the string "abc123".
The command below is work and return value "c123"
echo abc123 | grep -o [a-z][0-9]*$
But the command below does not work.
echo abc123 | ...
1
vote
1answer
42 views
how to find the higher java version on linux machine with bash or shell script
we need to test and compare java versions
any suggestion for tricky way how to verify if $version > $New_version ?
[root@master tmp]# version=$(java -version 2>&1 | awk -F '"' '/version/ {...
0
votes
1answer
18 views
How can i choose uppercase words with regexp
Hi i want a regular expression match all words with first letter uppercase.
But there is this greedy problem.
If i use \<[[:upper:]].*\> It will start matching at word starting with uppercase ...
0
votes
1answer
52 views
How to remove all comments from a javascript file using common Linux command line tools? [closed]
I have a javascript file with deeply needed comments. Javascript uses C style comments:
//this is a single line comment
And
/* this is
a multi-line
comment */
However, the actual code looks ...
0
votes
1answer
60 views
wget download regex pattern files from remote URL
I want to download all *httpd* RPM file from remote CentOS mirror and I am trying he following command but it doesn't seem to work
[root@yum foo]# wget -r --no-parent -A "*httpd*" https://mirrors....
0
votes
0answers
15 views
Text processing - Regex search for string and output unique values [duplicate]
I have a use case where I would like to search the following text for any Windows AD objects in backslash format. Here is a use case to use as an example.
My goal is to output the unique results to a ...
1
vote
1answer
53 views
Ask sed to ignore all special characters [duplicate]
I use the following code to delete a line :
sed -i "0,/$DELETE_THIS/{/$DELETE_THIS/d;}" file.txt
But this code fails if the variable DELETE_THIS contains special characters, like ., /, * and so on......
0
votes
1answer
45 views
Regular expression used in sed not giving the desired result between intervals [duplicate]
I am using the sed command to get the data between 2 dates. I am using regular expression matching the pattern for the dates.
The sample data I am using is somewhat like:
192.168.0.123 - - [25/Nov/...
2
votes
1answer
24 views
Filter files by string timestamp in filename
I've got a folder with several thousand files with names like ousjgforuigor-TIMESTAMP.txt
The timestamp is a standard Unix timestamp (e.g. 1543932635). Is there an easy way to list only files with a ...
1
vote
2answers
39 views
Postfix: Remove the software name in the email header
I need to remove the software name in the email header. Every time when I send the emails, the postfix server sent emails at the destination the emails headers include the following:
by mail.example....
0
votes
0answers
21 views
How to create a regex matching a custom string at the beginning of line while ignoring all preceding whitespaces via ag silversearcher?
Give an example file with the content:
// find me
val ignore me = "" // I should not be found
// find me
// find me
I want to find all the lines with find me using ag silversearcher.
...
0
votes
1answer
48 views
Get lines of file matching a regex
Is there a more compact way to get lines of a file that match a regex than the following?
open my $fh, '<', $file or die "Cannot open $file: $!";
while ( my $line = <$fh> ) {
next ...
0
votes
2answers
67 views
Grep only numbers, not the alphanumeric entries
I have a list of values like:
1
2
3
4
Ak123
Ak23
Ak147
1Apple
2Apricot
3Mango
4Orange
I just want to execute a simple grep command to list me only the numbers. i.e. 1, 2 , 3 and 4.
I tried this ...
0
votes
1answer
32 views
AWK print specific fields without specific word
Input:
a-0;Password-1010;c-ss;d-fk;h-14;i-jawad;j-dd;Email-1@1.com;
a-7990:15:71;b-aa;c-1;Password-2020;h-iOS;Email-2@2.com;
Output:
1@1.com,1010
2@2.com,2020
my input file is the same as my ...
0
votes
1answer
47 views
Insert new text in the middle of a file replacing old text without re-inserting the same things over and over?
I have a file that I want to update relatively frequently.
What needs to be done is that a specific part of the file would be changed to include some more lines. I am doing it with sed and \a option:
...
0
votes
1answer
54 views
some sed commands fail when in background
Some sed commands seem to fail when run in background. Minimal example below.
One sed command appends append after a block of lines that begin with a star *. The other just substitutes a word. The ...
1
vote
2answers
18 views
How to use sed regex to replace to words related to each other and one character between them
How to use sed regex to replace to words related to each other and one character between them with out change the character and the two words as group
like that
ahmed#mohamed
ahmed$mohamed
...
0
votes
3answers
35 views
how to check if FQDN host-name is with only small letters
we want to check the hostname on machines
the rule should be like this:
each hostname must be only with small letters
each hostname is FQDN
we try this
hostname=master01.nassa.com
[[ $hostname =~ ^...
1
vote
1answer
40 views
perl-rename - What is the difference between /g' and /'?
I want to replace all dashes in all .txt-files with spaces.
Fortunately, I ultimately found using
perl-rename 's/[-]/ /g' *.txt
does what I want. But before that, a few minutes of search and t&...
2
votes
2answers
174 views
How to write regexp literal in match expression?
This question is about the proper way to write regular expression literals in a match expression under bash.
In zsh, the match below succeeds, as I expected:
% [[ ' 123 ' =~ '^ [0-9]+ $' ]]; echo $?
...
2
votes
4answers
53 views
Compare the numbers in text file, if meets the condition run a shell script
I have a text file (created by a script) which contains only numbers in a single line like "5 17 42 2 87 33". I want to check every number with 50 (example), and if any of those numbers is greater ...
0
votes
1answer
38 views
bash regular expression point “.” character not matching
The string I'm trying to match is an ip address and I've seens quite some examples on the web. However it appears that I'm missing something which may or may not have to do with the differences ...
0
votes
1answer
32 views
sed/awk file data manipulation
I have many text files prepended with digits like this:
12 some text here
some text here
some text here
Or sometimes like this:
123 text here
some more not-so-interesting text here
some text here
...
1
vote
2answers
52 views
Regex, delete all characters after the last occurrence of “/”
I have a list of pathnames like this in a file:
/path/to/directory/one.txt
/longer/path/to/some/directory/two.py
/path/with spaces/in/it/three.sh
I want to delete all characters after the last ...
0
votes
2answers
44 views
Replace same line in file 1 from file 2 with conditon
File 1:
19a9s
c9019
5777
File 2:
99a9s
89019
10919
Expected output
19a9s
89019
5777
So in file 1 on line#2 it's start with letter c. which i would like to use it as condition if the line start ...
0
votes
2answers
50 views
Regex for sed/awk command
I would like to change the file content which i specified like below.I want to comment out all the lines which contains ".class" except the class name i provide.
@MyClass1.MyClass2(value = {
...
1
vote
2answers
136 views
How can I use a bash variable as a regex argument to gsub() and match()?
I have a script
#! /bin/bash
awk -v pat="$1" '{ if(match($0, pat)) {print $0} }' "$3"
awk -v pat="$1" -v rep="$2" '{gsub(pat, rep); print $0}' "$3"
I would like to run it like
myscript '\.\.+' ' ' ...
