Questions tagged [regular-expression]
Regular expressions are a means of matching a pattern of characters within a string.
0
votes
1answer
28 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
28 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
38 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
49 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
119 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 '\.\.+' ' ' ...
0
votes
1answer
22 views
What is the correct syntax for rsyslog's re_match()?
I'm trying to filter unwanted messages from a cron job (systemd) from rsyslog output. However rsyslog always complains about the second argument of re_match(). The filter rule I have is:
if $...
3
votes
2answers
270 views
regex to add missing quotes
I am trying to add missing quotes at the ends of some lines in a text file.
I find that the regex [^\"]$ suffices to find lines with missing terminal doublequotes and so tried the following ...
4
votes
4answers
362 views
sed: replacing entries in the /etc/fstab
I'm in the process of hardening some of our systems. As part of that hardening process, I need to update a few entries in the /etc/fstab to limit the capabilities of some of the various partitions.
...
5
votes
2answers
134 views
Perl command line regex to modify all pattern matches
I'm trying to use some arithmetic over the matched patterns in perl command line. I'm able to do it for one match but not for all.
str="a1b2c3"
perl -pe 's/\d+/$&+1/e' <<<"$str"
a2b2c3
...
1
vote
4answers
39 views
Bash regex whitespace before match
I'm trying to match a line in a textfile with
if [[ ${regel} =~ ([\s][CN][G]{2}[A]{2}[T]) ]];
I also tried instead of /s to use /A and /b
couple examples of things I tried:
if [[ ${regel} =~ (\A[CN]...
1
vote
2answers
47 views
Matching exact number of digits in a string
Given a string, how can I find out that it contains exactly 7 consecutive digits number?
Such as 1505082 or 1505082_CSE_322 but not 15050821 or 15050821_CSE_322
I've tried
grep -Eq [0-9]{7} <&...
-1
votes
3answers
31 views
Removing first forward slash from string
I'm trying to remove the first / from a string in a shell script.
For example
file:///path/to/file
and output to
file://path/to/file
-2
votes
0answers
32 views
Splitting text files based on a semi-regular expression
I have a number of pretty large text file that I want to split into a bunch of smaller files (the number of files will vary file to file).
All of them follow a the same pattern:
"id": 999999,...
0
votes
0answers
29 views
What will match this regexp - ^[-w._()]+$? [closed]
As the title says, could I get a few strings that will match this regexp
^[-w._()]+$
Better still, a brief explanation - thanks!
The reason I'm asking is that I'm trying to create a new docker ...
0
votes
0answers
21 views
How to iterate pattern by other one?
I have the bellow output. I try to iterate same times the Date and Time: Month Day Year HH:MM:SS for each Application n.n string found it.
=========================================================...
1
vote
1answer
32 views
Debian: Remove redundant package terminology
When I install a LAMP server environment on Debians I use this code:
apt-get upgrade lamp-server^ php-cli php-curl php-mbstring php-mcrypt php-gd python-certbot-apache -y
If I add more php-X ...
0
votes
5answers
82 views
AWK from text with modification
I have the following file:
hello there. let's try&ACCT=1&bla bla bla&EX=1118&anything ss &SERIAL=1011&DEAL=NO
BLA BLA BLA&TOM=1&ACCT=2&LSLSLSLSL&none=1&EX=...
1
vote
1answer
22 views
Excluding certain files from moving but move hidden ones too
In my deployment script I have such as code to exclude certain files.
shopt -s extglob
mv !(deploy.sh|file1|file2) ~/$public
It works almost well but ignores hidden files so they are not moved. How ...
-3
votes
2answers
71 views
Is pattern `^-0+([0-9]+)` the same as `^-0+([1-9]+)`?
Jeff wrote at errors in parameter expansion on filenames named after negative numbers
My best direction at this point is to do something like [[ $b =~ ^-0+([0-9]+)$ ]] && b=-${BASH_REMATCH[...
1
vote
1answer
29 views
Getting email addresses from a file using grep with Regex not working?
So i have a file that contains emails like this :
theirEmail@domain.com:theirUsername
theirEmail@domain.com:theirUsername
...
i want to extract emails that start with PA and then follow up with 6 ...
7
votes
4answers
934 views
BASH: Check in /etc/shadow if user password is locked
Objective: Check in /etc/shadow if user password is locked, i.e. if the first character in the 2nd field in /etc/shadow, which contains the user's hashed password, is an exclamation mark ('!')
...
0
votes
0answers
21 views
For a sed insertion, the line inserted does not have spaces, how can I add spaces? [duplicate]
#!/bin/bash
sed -i\.backup $'
/def test/ i\\
@unittest.skip("skipping")
' inputfile.txt
If inputfile.txt contains
class A():
def test_function(def)
After running the script I would like to ...
0
votes
1answer
13 views
replace first semicolon occurence
Hi I have a logfile and I want to replace the first semicolon occurence, like:
head1;head2;head3;head4;head5
blabb;blabl;;blab;blabl;;bla
Desired output:
head1;head2;head3;head4;head5
blabb;...
0
votes
3answers
68 views
Insert a line break before a numeric field or before an alphanumeric field that is just after a numeric field
I have this line
word1 word2 1234 4567 word3 8901 word4 word5 2541 5142 word5
I want to split this line in order to insert a line break before a numeric field or before an alphanumeric field that is ...
0
votes
0answers
8 views
RegEx throws Error : Template variables could not be initialized [migrated]
I am using the below regex : ^(?!.*(ab1-canary|cd1-staging|cf-ab1-canary)).*$ ; This works well in python but fails to do so in GO language. Could you please help me in getting the right regex for GO.
...
0
votes
1answer
49 views
Syntax for regular expression searching for DNA codons
I have to write a script for an assignment which will take the file name as a command and output every unique 3 base codon in the file and how many times it occurs in descending order. The script has ...
0
votes
1answer
33 views
Bash check reg expresion one or more times
I want to check if the variable 'X' is in the following parttern [a-zA-Z0-9]+:[0-9]+:[0-9]+, I check it with if [[ "${X}" =~ [a-zA-Z0-9]+:[0-9]+:[0-9]+ ]]
Now I want to add and option that this ...
0
votes
1answer
33 views
Find and replace a pattern using sed or awk [closed]
I have a file with multiple occurrences (more than 1000) of:
REF*SY*111111111, REF*SY*777777777, REF*SY*145485450...etc.
I need all the data be replaced with a standard output:
REF*SY*111111111,REF*...
0
votes
2answers
25 views
extract field from file using sed or awk
I have bash script to collect all hardware info but following memory info piece is missing, so this is what i am trying to do.
Following command give you status of DIMM memory module,
[root@Linux ~...
4
votes
1answer
301 views
/(.+)\n\1/ works but /(.*)\n\1/ doesn't when they should both work
I was playing around with sed after answering another question and I noticed that .+ and .* are not giving the same result when they both match multiple characters in a context address.
The following ...
0
votes
1answer
30 views
How to negate Bash's Regular Expression Matching Operator
Bash has the =~ regular expression matching operator. Here is an example of using it:
#!/bin/bash
input=$1
if [[ "$input" =~ "[0-9][0-9][0-9]-[0-9][0-9]-[0-9][0-9][0-9][0-9]" ]]
# ^ ...
1
vote
4answers
47 views
RegEx for matching strings in 2nd and 5th columns using grep
I have a file (test.txt) that contains string such as:
name1,6.5.8.12,specs1,version1,['66.55.89.12']
name2,19.13.13.159,specs2,version2,['13.13.173.59'; '14.19.232.42']
name3,141.101.196.40,specs3,...
0
votes
1answer
47 views
Grepping on du -h for all the files that are larger than 1GB
So my disk is full, I am trying to grep for all the files larger than 1G. I tried searching for the word Sort in the man page of DU, but found nothing.
du -h . | grep -E "^\d*\.\d*G"
and also this.
...
0
votes
2answers
48 views
Find and replace a word in all files based on file pattern
I have a variable called "User": "x-73098" in multiple files and the file names like astro_root_sys-dev.txt.
How to find all the files which have "User": "x-73098" variable and replace that ...
3
votes
5answers
232 views
sed on OS X - extract all text that is between square brackets
Given this stream:
[foo] 123 [bar]
[gar] dsa [har] 345
[uf] 88 [gc] 43 [br]
I want to process this with sed (or anything else) so the output would be:
foo bar
gar har
uf gc br
I tried cat myfile | ...
0
votes
3answers
49 views
Extract a string out of key, value from a text file, and assign to a new variable
Need a script to iterate through below file to read keys, values and extract values eg. foo_key1, foo.com, /tmp/worker${Build_Number} out of key and values assign them to another variable (eg. A="...
-1
votes
1answer
30 views
How to get specific files in SFTP using regex
I am trying to get files from specific range date (11-OCT to 15-OCT) using SFTP via SecureCRT:
File name: PEM_CUST_REC_G0X_20181016XXXXXX.gz
*20181016 represents the file date (YYYYMMDD).
X ...
0
votes
2answers
26 views
find specific files and copy them to a directory in linux
abc-1.0.zip
kncb-1.0.zip
jenk-1.1.zip
I want to find all the above files dynamically and copy them to a directory except jenk-1.1.zip. I have tried the below command but it also copies file(jenk*....
0
votes
1answer
13 views
`lvs -a` — filtering by name with regex
Is it possible to filter output of lvs -a using lvs command (I know that it is possible with grep, however I look for some approach with lvm only).
I mean listing only snapshosts and/or filter by ...
0
votes
1answer
47 views
how to move a file after identifying it with ls | egrep , or “egrep” vs “find”
I need to move all images with a specific filename string to a specific directory.
This is an example filename
facility_92+SOURCE1+SOURCE1.0
After the 'facility_' there can be 1 to 5 digits.
The ...
0
votes
2answers
88 views
Using regular expression for rm and ls
QUESTION:
What is happening here and how do I fix it?
PROBLEM:
When I do:
$ls | grep -P "file[1-9]{3}.txt|file[1-9]{2}.txt"
I get:
file11.txt
file12.txt
file13.txt
file14.txt
file15.txt
file16....
-1
votes
2answers
41 views
How to save a number from a text file in python? [closed]
I have a text file, from which I have to extract a number, which is in the line called "width:"
It is like:
width: 3432
Now I am trying:
import re
file = ...
1
vote
1answer
46 views
Regex - Capture string following timestamp
Looking for an efficient Regex to capture the string following the time stamp in the following:
<38>Oct 10 14:32:29 UAT01
<86>Oct 10 14:32:29 Test04
<13>Oct 10 14:35:09 Dev02
<...
0
votes
2answers
26 views
Comparing directory files based on filename
I currently have a directory of files that looks something like this:
abcd.txt
abcd_.txt
qrst.txt
qrst_.txt
wxyz.txt
wxyz_.txt
In theory, every line in abcde_.txt should be contained in abcd.txt, ...
0
votes
2answers
32 views
Regex to separate capital letter words from title case words?
I have a string formatted like this:
Meaningless Garbage I Don't Want INFO I'M LOOKING FOR
The meaningless garbage and the info I'm looking for are of variable length, however the info I'm looking ...
1
vote
1answer
36 views
remove all spaces from specific field separated by comma
Input:
11 22 33 44,1 2,2
Output
11223344,1 2,2
I'm looking to remove all spaces in field number 1, which is before the first comma.
0
votes
1answer
30 views
log processing/entry deletion, multi-pipe (grep sed grep), log traversed twice. can this solution be improved?
Is there a cleaner way? A single pass of the large input.txt file would be preferred. Solution so far:
grep -e "\[.*fred" input.txt |sed 's/.*\[\([^]]*\)\].*/\1/g' |grep -vf /dev/stdin input.txt
...
0
votes
0answers
59 views
grep: conflicting matchers specified
I'm using find with xargs and grep to find text which we need to translate in our application.
find . -name \*.vue -not -path "./vendor/*" -not -path "./node_modules/*" -not -path "./public/*" -not -...
0
votes
2answers
58 views
Trying to learn regex, to find files of a certain length?
I have a file that has a list of countries of various lengths. This file is called countries and is in my working directory.
I want to run a the grep command that tells me which countries have nine ...
1
vote
1answer
47 views
How do I extract overlapping character patterns with regex?
Is it possible to create a regular expression that would match overlapping character patterns?
For example, I'd like to match abc, bcd, cde and def from string abcdef.
If it is not possible, can you ...
