Regular expressions are a means of matching a pattern of characters within a string.
0
votes
3answers
41 views
Strip the file base name, keep the directory part
I have a string which looks something like this
dir/subdir/othersubdir/file.txt
But it can also look like
dir/file.txt
or
dir/subdir/file.txt
Now, I am making a script where $P is the full ...
0
votes
3answers
64 views
Shell script to add or replace block of text?
I'm looking for a shell script (Bash) that adds or replaces copyright text at the beginning of the file (for .c and .h files).
It should search and add or replace the copyright text block for all the ...
0
votes
1answer
32 views
combining grep ignore and matches
I would like to grep a file to find all instances of the text fn1 that don't have the word call in front of it and print out four lines before and after the matches (even if the surrounding lines have ...
3
votes
2answers
132 views
Sed: modify every non-first word repetition for every word in text
Can you help me to do something like that using sed?
qq ab xyz ab qq aa ab
Becomes:
qq ab xyz +ab+ +qq+ aa +ab+
1
vote
2answers
32 views
Why doesn't my regex work in bash “if”? [duplicate]
Here is my code:
if [ -f /Applications/xml[0-9].pl ]
I also tried with -f =~ and double brackets but none seem to work.
I first though that the regex might be faulty but I tried this.
echo h1 | ...
0
votes
2answers
42 views
Bash regex string manipulation bug
I have an issue with bash and its regex match ability that I for now think is a bug in bash but could also be me having missed something obvious. I hope it is the latter.
I have made this function in ...
0
votes
2answers
40 views
Regex long list of numbers
What is the command in Linux to find the regular expression e for every number from 37 to 200 included in a list with such numbers?
3
votes
2answers
35 views
Coloring tail output with perl
tail -f logfile.log | perl -pe 's/.*foo*/\e[1;41m$&\e[0m/g'
will color all the lines containing the pattern "foo" in the logfile.log file.
How can I make use of this in order to highlight ...
2
votes
2answers
120 views
regex - Searching for only character pairs
I have the following data from which I mean to extract only those lines which contain "bb" only. Not "b" or "bbb" or anything else just "bb".
abb
abbb
aabbcc
aabab
abbbbc
Now when I use the ...
0
votes
1answer
50 views
No output from grep -P 'com\K\w+'
I have a source file saved off the internet which has various links I want to pull data from. For example https://blahblah.com/uniquetext
I'm using
grep -oP 'com\K\w+' source.txt > list.txt
...
1
vote
2answers
129 views
grep pattern exacly matching from file and search only in first column
I have a bigfile like this:
denovo1 xxx yyyy oggugu ddddd
denovo11 ggg hhhh bbbb gggg
denovo22 hhhh yyyy kkkk iiii
denovo2 yyyyy rrrr fffff jjjj
denovo33 hhh yyy eeeee fffff
then my pattern file ...
0
votes
2answers
34 views
How to make my regular expression accept zeroes in the input?
I wrote a regex that accepts numbers between 0 and 999,999,999,999.99. Commas are optional, but, still should accept value not higher than 999999999999.99. I wrote one, but, there are two flaws in it.
...
2
votes
5answers
125 views
Remove backslashes from a text file
I have
Input:
NISHA =\455
Output:
NISHA = 455
I want to remove \ from output. I tried to use command sed "s/[\]//g" P but it is not working and it flags an error:
character found ...
3
votes
3answers
26 views
Parsing Log Files with sed -e. Need to count unique class names
I have a file, let's call it filename.log, in it I have something like this
(2014-11-18 14:09:21,766), , xxxxxx.local, EventSystem, DEBUG FtpsFile delay secs is 5 [pool-3-thread-7]
(2014-11-18 ...
1
vote
4answers
142 views
SED command not replacing (working regex)
I'm trying to replace in one of my projects all mysql to mysqli, with their parameters. To do so, I'm searching for all files with mysql in my folder recursively and replacing it with mysqli.
Ex:
...
0
votes
0answers
48 views
how to exclude range of numbers using regular expression
I'm trying to write a regular expression in order to cover all numbers starting with 1809 and excluding some ranges:
Ranges needed to be excluded
Starting with 1809 and followed by:
...
3
votes
3answers
97 views
Why does my grep expression need to use $'string' to match tab characters?
If you take this code:
echo -e '\t\t\tString' | grep '^[\t]*String'
the result is blank because it doesn't match, yet this:
echo -e '\t\t\tString' | grep $'^[\t]*String'
works. I swear that I ...
0
votes
1answer
27 views
regexp in find to locate only
I have csv file (products.csv) with product numbers
$ cat products.csv | head -3
2.20
2.21
2.22
in another directory I have thousands of product images in subdirectories.
I need to locate product ...
1
vote
0answers
18 views
grc: Highlight capture groups only?
Recently I came across grc and I find it really simple. However, I would like to highlight some chunks of regex-matched text. For example, svn status properties conflict highlight I hoped to work:
...
2
votes
4answers
141 views
remove leading string in bash
I try getting this sed command to work.
I have a string like rev00000010
and I only want the last number, 10 in that case.
I have tried this:
TEST='rev00000010'
echo "$TEST" | sed ...
0
votes
3answers
84 views
Simple way to extract value from HTML
I have a very simple html file with a value inside. Value is 57 in this case.
<eta version="1.0"><value uri="/user/var/48/10391/0/0/12528" strValue="57" unit="%" decPlaces="0" ...
1
vote
1answer
29 views
Search and remove with regular expression
How do you use regular expression in bash to search any given string and remove occurrence of particular word? This is the expression I've come up with
^([A-Za-z-]+)(-).*(el6.*)$
What I would like ...
1
vote
2answers
44 views
How can I use sed to remove the first paragraph of the file?
So the paragraph is defined by having a empty line at the end.
Lorem ipsum dolor sit amet, consectetur adipiscing elit.
Nunc et nisi tristique, facilisis orci nec, pellentesque tortor.
...
1
vote
1answer
33 views
perl rename: Prepending something to a set of file names across subdirectories
Although perl's rename tool has become an invaluable companion for my daily work, there are still some quirks that make work more difficult - especially when files are not in current work directory.
...
4
votes
3answers
146 views
Use sed to delete all but a certain pattern
How do I get just the link part in the http-source of a link?
I have
<a href="http://unix.stackexchange.com/users/20661/">Unix & Linux
and would like to get just
...
-1
votes
1answer
27 views
SMTP log anonymize script
I have a SMTP log with records in the format below:
6,222.3.4.5,3040,100.2.3.4,25,UNKNOWN,0,1,……,9337bc-929a-34c0-29a8-b3a89c834b29 ,protocol,SMTP ,745663746,STATUS-COMPLETE ,VALID
...
1
vote
5answers
73 views
Regular Expression for Mixed cased words
I want a regular expression that will help me identify if a certain pattern is present as a mixed case in a sentence or not.
Say:
Fox juMPed the rock
Now, I want to find that if the pattern ...
0
votes
1answer
30 views
How to escape unbalanced brackets or slash in sed?
I'm trying to use sed, but my pattern contains [] brackets and slashes (/).
I've tried quotes, but it doesn't help.
How do I escape it?
Examples:
$ sed -i'.bak' "s/^includes[] =/;includes[] ...
4
votes
5answers
113 views
how to use regex in alias?
I want to create the alias for the command "ssh [email protected]" as 10.32.44.225
alias [0-9][0-9][0-9].[0-9][0-9][0-9].[0-9][0-9][0-9].[0-9][0-9][0-9]="ssh user@$0"
I have created it, but it is ...
0
votes
0answers
16 views
To visualise look-behind in this Regex
I am using Regexr to visualise my regexes now.
I need look-behind but Javascript does not support it, example code here.
The project code base seems to be dependent Javascript (NodeJS) in Github.
I ...
8
votes
2answers
423 views
In VIM, replace path with slashes without using escape slashes
In vim I want to substitute a long path /a/b/f/g/d/g with another /s/g/w/d/g/r in a text file. Usually I use \/ but there are too many slashes here. Is there an easier way?
1
vote
1answer
43 views
How to nest global matches with sed?
If I do:
sed 's/match/replace/g'
I know that sed will substitute replace for every occurrence of match on a line. But what if...?
echo "match <please dont match this?>" |
sed ...
1
vote
0answers
27 views
Need .htaccess Rewrite Rule To Remove Trailing <br%20/>
I have links that for some reason have a trailing <br%20/> and I don't know where they are coming from to try and fix them. So I need a general rewrite rule to remove them so the links won't ...
2
votes
2answers
215 views
How can I remove lines matching foo but not matching bar?
Assume I want to remove the 2nd and 3rd, but not the 4th line in the following file (those which match foo but do not match bar), can I easily do this with e.g. sed?
text
foo some more text
even more ...
3
votes
4answers
271 views
Decreasing a number with sed
I extracted the metadata of a PDF in a .txt file using pdftk, and now I am trying to decrease the BookmarkPageNumber value for each bookmark by an integer. The .txt has these lines:
BookmarkBegin
...
1
vote
3answers
76 views
Remove patterns from string using bash
I'm trying to remove some patterns from a file input string (parsing file line by line). Here is a sample string:
1: (10/17 12:49:31.175) - CONSTANT ID1 - CONSTANT ID2: RAW DATA OUT > ...
1
vote
1answer
57 views
Regex for contains at least one instance of STRINGA and no instances of STRINGB
What regex will match:
contains at least one instance of "1221", and no instances of "7474"
i.e. matches "7777 1221 4543"
but does not match "7777 1221 7474 4543"
I suspect I have to use negative ...
10
votes
4answers
451 views
Regular expression using \\ vs using \
Why does
grep e\\.g\\. <<< "this is an e.g. wow"
and
grep e\.g\. <<< "this is an e.g. wow"
do the same thing?
If I add a third slash, it also has the same result. BUT, once I ...
1
vote
2answers
67 views
-1
votes
1answer
118 views
Regular expression to mask credit card digits in a file
What is the most simplest way to mask all numbers but the last 4 digits of a credit card number in a file using sed.
Using egrep with the following regular expression we can find numbers of Visa, ...
0
votes
0answers
37 views
Find & replace image URLs in one file from another file
I am trying to replace all the image source URLs in an HTML file from a list of URLs in a text file.
File1.html
<td class="MetadataRes" width="380px" colspan="2" style="border-top: 1px #336699 ...
1
vote
3answers
192 views
“bad flag in substitute command: '{” while replacing a string with sed from one file to another file
I am trying to replace strings found in File1 with strings in File2
File1
<IMG SRC="/Repository/GetImage.dll?baseHref=Orange/2011/03/27&EntityID=Ad12911&imgExtension=" />
...
2
votes
4answers
90 views
replace several comma out side one or more sets of curly braces and exception that in one or more sets of curly braces
In the text file I have multi records. Every record has multi column with comma separated, some column have one sets of curly brace and other have more than one curly brace.
I need:
If a comma is ...
0
votes
2answers
53 views
Regex to grep filler followed by signed float
I want to extract the last column from lines that look like:
880.952 NAV_Y uSimMarine -146.17516
The number isn't always negative, and isn't a fixed length (i.e. doesn't ...
2
votes
2answers
27 views
Match from current line until a line that doesn't match a pattern
I really tried searching but could not find anything (it's hard to know what exactly to search for).
I know how to do this with sed: print from current line until the line that matches SOMETHING:
...
1
vote
1answer
89 views
Regex works in shell but not through Perl script
I'm having trouble executing a Perl script through the Unix shell using Perl's system command.
I've had more complex regex commands I had to adjust accordingly to convert from Unix to Perl, and ...
0
votes
2answers
47 views
To match only innermost environment by Regex
I want to match the innermost environment of begin{question} and its corresponding end{question}.
Example data
\section{Takayasu arteritis}
\begin{question}
{You get a patient.
What do you notice ...
2
votes
1answer
104 views
To write this Pseudocode with Regex
I am doing a Makefile which I run regularly by Crontab every day at 0230
crontab -e; 30 2 * * * /bin/thePseudocode
Python-like Pseudocode
directories = ["Cardiology", "Rheumatology", "Surgery"]
...
0
votes
3answers
87 views
Bash Combine Replacement and Sub String Extraction in One Step
For a string in this format:
./my-site.sub.domain.com
I would like to remove the .,-, and /, and trim the remainder to 16 characters: mysitesubdomainc
I've done this
...
4
votes
4answers
80 views
Replace using vim - Replace a pattern […] by a string
I have a file containing lines in below e.g. format -
[[email protected], [email protected]], Payment processed - 23499, params = {'invoice':3243}
I only want the account numbers i.e. 23499. It's a number. ...
