Regex Remove lines containing help etc

Question

I have a long document of commands  Using Notepad   or regex  I want to delete all lines containing  help  including keyboard help  etc   How can this be done

User · Answer

If you re on Windows  try findstr  Third-party tools are not needed   findstr  V  L  searchstring  inputfile txt  gt  outputfile txt   It supports regex s too  Just read the tool s help findstr      P S  If you want to work with big  huge files  like 400 nbsp MB log files  a text editor is not very memory-efficient  so  as someone already pointed out  command-line tools are the way to go  But there s no grep on Windows  so     I just ran this on a 1 GB log file  and it literally took 3 seconds

User · Answer

Search with a regular expression       help

User · Answer

Another way to do this in Notepad   is all in the Find Replace dialog and with regex    Ctrl   h to bring up the find replace dialog  In the Find what  text box include your regex    help   r  n  where the  r is optional in case the file doesn t have Windows line endings   Leave the Replace with  text box empty  Make sure the Regular expression radio button in the Search Mode area is selected  Then click Replace All and voila  All lines containing your search term help have been removed

User · Answer

This is also possible with Notepad      Go to the search menu  Ctrl   F  and open the Mark tab  Check Bookmark line  if there is no Mark tab update to the current version   Enter your search term and click Mark All   All lines containing the search term are bookmarked   Now go to the menu Search  rarr  Bookmark  rarr  Remove Bookmarked lines Done

User · Answer

Easy task with grep   grep -v help filename   Append  gt  newFileName to redirect output to a new file     Update  To clarify it  the normal behavior will be printing the lines on screen  To pipe it to a file  the  gt  can be used  Thus  in this command   grep -v help filename  gt  newFileName    grep calls the grep program  obviously -v is a flag to inverse the output  By defaulf  grep prints the lines that match the  given pattern  With this flag  it will print the lines that don t match the pattern  help is the pattern to match filename is the name of the input file  gt  redirects the output to the following item newFileName the new file where output will be saved    As you may noticed  you will not be deleting things in your file  grep will read it and another file will be saved  modified accordingly

User · Answer

You can do this using sed  sed   help  d   lt  inputFile  gt  outputFile

[regex] Regex: Remove lines containing "help", etc

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