In addition to Don's suggestion :
grep does not know +, so you woud need to use \{1,\} instead.
In the example, a closing square bracket and repeat operators appears to be missing, so I think it would need to be modified like so:
Where both the sub-pattern and its back reference are on word boundaries, either at the beginning followed by space, at the end preceded by space or in between space characters.
But without word boundary operators, it gets more complicated when the words do not have to be adjacent:
Another thing to note that this is just the case where words are on the boundaries with a space. But there can be comma's, semicolons punctuations etcetera.
--
If you have GNU or BSD grep (as opposed to standard grep) then you can use word boundaries as an extension to regex, so it can be simplified into something like this:
They also support back reference with extended regular expressions so, you can can do this:
Note in general instead of [a-z], it is preferable to use [[:lower:]] for lowercase or [[:alpha:]] which matches both upper and lower case in all compliant code sets..
Last edited by Scrutinizer; 10-19-2017 at 10:47 PM..
This User Gave Thanks to Scrutinizer For This Post:
Hi Folks !!!!!!!!!!!!!!!!!!!
My Requirement is.............
i have a input file:
501,501.chan
502,502.anand
503,503.biji
504,504.raja
505,505.chan
506,506.anand
507,507.chan
and my o/p should be
chan->3
i.e. the word which occurs maximum number of times in a file should be... (5 Replies)
Hi all,
I have a file with lines written somewhat like this.
aaaa
ccc
aa
linux
browse = no
xssxw
cdcedc
dcsdcd
csdw
police
dwed
dwd
browse = no
cdecec (2 Replies)
I've been looking on the internet, and haven't found anything simple enough to use in my code. All I want to do is count how many times "-" occurs in a string of characters (as a package name). It seems it should be very simple, and shouldn't require more than one line to accomplish.
And this is... (2 Replies)
Hi folks,
have a look into the attachment, i am not familiar with unix, can you please help me in this regard.
thanks in advance, :)
regards,
Geeko (4 Replies)
Hi Everyone,
I am looking for a simple way for replacing all the files under a directory that use the server "xsgd1234dap" with "xsdr3423pap".
For Example:
In the Directory,
$pwd
/home/nick
$ grep -l "xsgd1234dap" *.sh | wc -l
119
I have "119" files that are still using... (5 Replies)
I have a file that has the words I want to find in other files (but lets say I just want to find my words in a single file). Those words are IDs, so if my word is ZZZ4, outputs like aaZZZ4, ZZZ4bb, aaZZZ4bb, ZZ4, ZZZ, ZyZ4, ZZZ4.8 (or anything like that) WON'T BE USEFUL.
I need the whole word... (6 Replies)
hi all, I'm new there, I'm just playing with perl and lwp and I just successfully created a script for log in to a web site with post. I have a response but I would like to have something like this:
I have in my response lines like:
<div class="sender">mimi020</div>
<some html code.....>... (3 Replies)
I want to burst a report by using the page number value in the report header. Each section starts with *PAGE NO:* 1 Each section might have several pages, but the next section always starts back at 1.
So I want to find the "*PAGE NO:* 1" value and pull all lines that follow until "*PAGE NO:* 1"... (4 Replies)
I have a file: file.txt, which contains the following data in it.
This is a file, my name is Karl, what is this process, karl is karl junior, file is a test file, file's name is file.txt
My name is not Karl, my name is Karl Joey
What is your name?
Do you know your name and... (3 Replies)
Hi All,
I am looking for a perl/awk/sed command to auto-increment the numbers line in file, P1.tcl:
run_build_model sparc_ifu_dec
run_drc
set_faults -model path_delay -atpg_effectiveness -fault_coverage
add_delay_paths P1
set_atpg -abort_limit 1000
run_atpg -ndetects 1000
I would like... (6 Replies)