logo
down
shadow

grep with star symbol


grep with star symbol

By : Jacques
Date : November 27 2020, 11:01 PM
like below fixes the issue grep requires (at least) two arguments -- what you are searching for, and where you are searching for it. If the second argument is not provided, then it will use stdin instead.
grep text* is waiting for stdin to provide it something to search through.
code :


Share : facebook icon twitter icon
Using the star sign in grep

Using the star sign in grep


By : Ahmad Dallah
Date : March 29 2020, 07:55 AM
wish of those help The asterisk is just a repetition operator, but you need to tell it what you repeat. /*abc*/ matches a string containing ab and zero or more c's (because the second * is on the c; the first is meaningless because there's nothing for it to repeat). If you want to match anything, you need to say .* -- the dot means any character (within certain guidelines). If you want to just match abc, you could just say grep 'abc' myFile. For your more complex match, you need to use .* -- grep 'abc.*def' myFile will match a string that contains abc followed by def with something optionally in between.
Update based on a comment:
GREP - Regex +(plus) vs. *(star) performance

GREP - Regex +(plus) vs. *(star) performance


By : Buso
Date : March 29 2020, 07:55 AM
I hope this helps . Simple question, say I have two regular expressions , These two expressions:
code :
rtmp.*?\b/
rtmp.+?\b/
grep: When should the kleene star(*) match itself?

grep: When should the kleene star(*) match itself?


By : Bill Batey
Date : March 29 2020, 07:55 AM
this one helps. * on its own is an invalid regular expression since there is no previous item to repeat. Your implementation of grep, in this case, interprets it as a literal *. \* is a valid regular expression which matches a *. Your implementation's interpretation of the invalid regular expression * and the valid regular expression \* just happen to be the same.
If you really want to see the difference between * and \*, you should try it on a valid regular expression by adding an item before it. For example, a literal a:
code :
grep 'a*'
grep 'a\*'
Using grep to search a string with a star(*)

Using grep to search a string with a star(*)


By : shugenghuang
Date : March 29 2020, 07:55 AM
this will help grep interprets its pattern as a regular expression, so * means repetition of the previous character (or subexpression). Use grep -F to get rid of this behavior.
grep/egrep the star operator not matching all occurrences

grep/egrep the star operator not matching all occurrences


By : Cleon And
Date : March 29 2020, 07:55 AM
seems to work fine Let's take the string AaAa. I want to match the as: , Let's start with this:
code :
$ echo AaAa | grep -o 'a*'
$
2.5.3
=====
Fix the combinations:
 * -i -o
 * --colour -i
 * -o -b
 * -o and zero-width matches
Go through the bug list im my mailbox and fix fixable.
Fix bugs reported with 2.5.2.
$ echo AaAa | grep -o 'a*'
a
a
$
Related Posts Related Posts :
  • qmake match linux and mac separatly
  • Permission denied after visudo nopasswd set for port command
  • Unable to add default root no such device error in linux
  • Why is Plex Media Server not working for me on Ubuntu 16?
  • gcc: what's the difference between "-g" and "-ggdb"?
  • what does the number mean that prefix package name?
  • Cannot pass parameters to slaves with distributed JMeter setup with Maven and linux
  • Memory used by compiling a code
  • sudo: effective uid is not 0, is sudo installed setuid root? (on mac os x 10.12)
  • can linux run without an RTC present on an embedded platform?
  • What is the difference between nonpreemptive and preemptive kernels, when switching to user mode?
  • Customize SHELL in Makefile (set SHELL=my_shell.sh)
  • Storing awk manipulation in variable
  • What is the difference between a block of data and a page?
  • Simulate network latency on specific port using tc
  • How can I record that sound going out of my speakers (not what's coming into the mic)?
  • git clone GnuTLS recv error (-9): A TLS packet with unexpected length was received
  • Script does not execute simultaneously in Linux
  • Dirty CoW mitigation on CentOS 7.2 - semantic error: while resolving probe point
  • Dialog: Show menu after option has been executed
  • How permanently kill dockerd?
  • URL breaking of at space in my shell script
  • Can't mount flash drive
  • How to tell compiler to pad a specific amount of bytes on every C function?
  • Transfer files between raspberry pi and Multiple Linux OS computers?
  • How would I disable accounts that have been inactive for 90 days in Linux?
  • grep search with regex
  • Rename files with spaces to underscore in all subcategories
  • Is there a way to have a.out loaded in linux x86_64 "high memory"?
  • AWK / Linux script calculations from a text file
  • Raspbian (jessie) open new terminal window
  • When typing 'ls' command I get 'zsh: command not found: gls'
  • Centos 6.8 - Updates repo issues
  • Parse string using shell
  • execute one command in all open tabs in a terminal
  • Restoring terminal settings (termios) in signal handler
  • How is Stack memory allocated when using 'push' or 'sub' x86 instructions?
  • rsyncing git project folder
  • mimic linux grep -w in perl grep
  • Send Email If Filename Exists
  • How to create GUI in dotnet core in Linux?
  • Curl and check for 403 error code
  • (Bash) How to monitor file changes within a directory (Creation, Deletion, Renaming)
  • Counting the same lines from output
  • Why start a background process from a subshell / why parens in (someCommand &)?
  • Ideal puppet repository for centos 7 distribution
  • How to debug an upstart script that intermittently fails?
  • i want read another kernel when an error occurs
  • Unable to disasembly my app -- no debugging information found
  • How to use "tee" with "source" command in Linux?
  • Qt 5.5 not binding to port
  • rhash -M argument not working in zsh on macOS
  • How to manually download, compile and install the tiff5 library on ubuntu 16.04 without root permissions?
  • shadow
    Privacy Policy - Terms - Contact Us © soohba.com