`grep -v` is your friend:

    grep --help | grep invert  

&gt; -v, --invert-match        select non-matching lines

Also check out the related `-L` (the complement of `-l`).

&gt; -L, --files-without-match only print FILE names containing no match

You can also use `awk` for these purposes, since it allows you to perform more complex checks in a clearer way:

Lines not containing `foo`:

    awk &#39;!/foo/&#39;

Lines containing neither `foo` nor `bar`:

    awk &#39;!/foo/ &amp;&amp; !/bar/&#39;

Lines containing neither `foo` nor `bar` which contain either `foo2` or `bar2`:

    awk &#39;!/foo/ &amp;&amp; !/bar/ &amp;&amp; (/foo2/ || /bar2/)&#39;

And so on.

In your case, you presumably don&#39;t want to use grep, but add instead a negative clause to the find command, e.g.

    find /home/baumerf/public_html/ -mmin -60 -not -name error_log

If you want to include wildcards in the name, you&#39;ll have to escape them, e.g. to exclude files with suffix .log:

    find /home/baumerf/public_html/ -mmin -60 -not -name \*.log


Apparently, the following is the valid syntax:

    b&#39;The string&#39;

I would like to know:

 1. What does this `b` character in front of the string mean?
 2. What are the effects of using it?
 3. What are appropriate situations to use it?

I found a [related question][1] right here on SO, but that question is about PHP though, and it states the `b` is used to indicate the string is binary, as opposed to Unicode, which was needed for code to be compatible from version of PHP &lt; 6, when migrating to PHP 6. I don&#39;t think this applies to Python.

I did find [this documentation][2] on the Python site about using a `u` character in the same syntax to specify a string as Unicode. Unfortunately, it doesn&#39;t mention the **b** character anywhere in that document.

Also, just out of curiosity, are there more symbols than the `b` and `u` that do other things?

  [1]: https://stackoverflow.com/q/4749442/346561
  [2]: http://docs.python.org/tutorial/introduction.html#unicode-strings

What does the &#39;b&#39; character do in front of a string literal?

Using core jQuery, how do you remove all the options of a select box, then add one option and select it?

My select box is the following.

    &lt;Select id=&quot;mySelect&quot; size=&quot;9&quot;&gt; &lt;/Select&gt;

EDIT: The following code was helpful with chaining. However, (in Internet&amp;nbsp;Explorer) `.val(&#39;whatever&#39;)` did not select the option that was added. (I did use the same &#39;value&#39; in both `.append` and `.val`.)

    $(&#39;#mySelect&#39;).find(&#39;option&#39;).remove().end()
    .append(&#39;&lt;option value=&quot;whatever&quot;&gt;text&lt;/option&gt;&#39;).val(&#39;whatever&#39;);

EDIT: Trying to get it to mimic this code, I use the following code whenever the page/form is reset. This select box is populated by a set of radio buttons. `.focus()` was closer, but the option did not appear selected like it does with `.selected= &quot;true&quot;`. Nothing is wrong with my existing code - I am just trying to learn jQuery.

    var mySelect = document.getElementById(&#39;mySelect&#39;);
    mySelect.options.length = 0;
    mySelect.options[0] = new Option (&quot;Foo (only choice)&quot;, &quot;Foo&quot;);
    mySelect.options[0].selected=&quot;true&quot;;

EDIT: selected answer was close to what I needed. This worked for me:

    $(&#39;#mySelect&#39;).children().remove().end()
    .append(&#39;&lt;option selected value=&quot;whatever&quot;&gt;text&lt;/option&gt;&#39;) ;

But both answers led me to my final solution..


How do you remove all the options of a select box and then add one option and select it with jQuery?

I have been trying to work out the syntax for this command:

    grep ! error_log | find /home/foo/public_html/ -mmin -60
OR: 

    grep &#39;[^error_log]&#39; | find /home/baumerf/public_html/ -mmin -60

I need to see all files that have been modified except for those named `error_log`.

[I&#39;ve read about it here](http://www.robelle.com/smugbook/regexpr.html), but only found one `not`-regex pattern.

Negative matching using grep (match lines that do not contain foo)

I have been trying to work out the syntax for this command:
<pre><code class="hljs language-arduino">grep ! error_log | find /home/foo/public_html/ -mmin -60
</code></pre>
OR:
<pre><code class="hljs language-arduino">grep '[^error_log]' | find /home/baumerf/public_html/ -mmin -60
</code></pre>
I need to see all files that have been modified except for those named <code>error_log</code>.
<a href="http://www.robelle.com/smugbook/regexpr.html" target="_blank" rel="noopener noreferrer">I've read about it here</a>, but only found one <code>not</code>-regex pattern.

hello I am trying what I thought would be a rather easy regex in Javascript but is giving me lots of trouble. 
I want the ability to split a date via javascript splitting either by a &#39;-&#39;,&#39;.&#39;,&#39;/&#39; and &#39; &#39;.

    var date = &quot;02-25-2010&quot;;
    var myregexp2 = new RegExp(&quot;-.&quot;); 
    dateArray = date.split(myregexp2);
    
What is the correct regex for this any and all help would be great. 

Javascript split regex question

I just want to create a regular expression out of any possible string.

    var usersString = &quot;Hello?!*`~World()[]&quot;;
    var expression = new RegExp(RegExp.escape(usersString))
    var matches = &quot;Hello&quot;.match(expression);

Is there a built-in method for that? If not, what do people use? Ruby has [`RegExp.escape`][1]. I don&#39;t feel like I&#39;d need to write my own, there have got to be something standard out there.

  [1]: http://ruby-doc.org/core/classes/Regexp.html#M001195





Is there a RegExp.escape function in JavaScript?

This is the regex I&#39;m trying to use:

    /^(\w|\.|-)+?@(\w|-)+?\.\w{2,4}($|\.\w{2,4})$/gim

I found it on [this site][1], and it works great when I try it out there. But as soon as I place it in my code, I get this message:

    Warning: preg_match() [function.preg-match]: Unknown modifier &#39;g&#39; in C:\xampp\htdocs\swebook\includes\classes.php on line 22

Can anyone explain what&#39;s wrong, and why it&#39;s working on that website and not in my code?


  [1]: http://gskinner.com/RegExr/


&quot;Unknown modifier &#39;g&#39; in...&quot; when using preg_match in PHP?

How can I have a regular expression that tests for spaces or tabs, but not newlines?

I tried `\s`, but I found out that it tests for newlines too.

I use [C#][1] (.NET) and [WPF][2], but it shouldn&#39;t matter.

  [1]: https://en.wikipedia.org/wiki/C_Sharp_%28programming_language%29
  [2]: https://en.wikipedia.org/wiki/Windows_Presentation_Foundation



Regular expression: find spaces (tabs/space), but not newlines

In other languages, in RegExp you can use `/.../g` for a global match.

However, in Ruby:

    &quot;hello hello&quot;.match /(hello)/

Only captures one hello.

How do I capture all `hello`s?

Ruby global match regexp?

I have a folder with about 1,700 files. They are all named like `1.txt` or `1497.txt`, etc. I would like to rename all the files so that all the filenames are four digits long.

I.e., `23.txt` becomes `0023.txt`.

What is a shell script that will do this? Or a related question: How do I use grep to only match lines that contain `\d.txt` (i.e., one digit, then a period, then the letters `txt`)?

Here&#39;s what I have so far:

    for a in [command i need help with]
    do
      mv $a 000$a
    done

Basically, run that three times, with commands there to find one digit, two digits, and three digit filenames (with the number of initial zeros changed).



Linux shell script to add leading zeros to file names

I want to grep for a function call &#39;init()&#39; in all JavaScript files in a directory. How do I do this using grep? 

Particularly, how do I escape parenthesis, `()`?


How to escape parenthesis in grep

I&#39;m running a `grep` to find any *.sql file that has the word `select` followed by the word `customerName` followed by the word `from`. This select statement can span many lines and can contain tabs and newlines. 

I&#39;ve tried a few variations on the following: 

    $ grep -liIr --include=&quot;*.sql&quot; --exclude-dir=&quot;\.svn*&quot; --regexp=&quot;select[a-zA-Z0-
    9+\n\r]*customerName[a-zA-Z0-9+\n\r]*from&quot;

This, however, just runs forever. Can anyone help me with the correct syntax please? 

Regex (grep) for multi-line search needed

Standard `grep`/`pcregrep` etc. can conveniently be used with binary files for ASCII or UTF8 data - is there a simple way to make them try UTF16 too (preferably simultaneously, but instead will do)?

Data I&#39;m trying to get is all ASCII anyway (references in libraries etc.), it just doesn&#39;t get found as sometimes there&#39;s 00 between any two characters, and sometimes there isn&#39;t.

I don&#39;t see any way to get it done semantically, but these 00s should do the trick, except I cannot easily use them on command line.

grepping binary files and UTF16

    % cat temp
    $$$ hello1
    $$  hello2
        hello3
    ##  hello4
        hello5 $$$
    % cat temp | grep &quot;$$$&quot;
    Illegal variable name.
    % cat temp | grep &quot;\$\$\$&quot;
    Variable name must contain alphanumeric characters.
    %

I want to grep for `$$$` and I expect the result to be

    % cat temp | grep &lt;what should go here?&gt;
    $$$ hello1
        hello5 $$$
    %

To differentiate, I have marked the prompt as `%`.

  - What is the problem here?
  - What should the **grep string** be?

Content Type	Original Author	Original Content on Stackoverflow
Question	jerrygarciuh	View Question on Stackoverflow
Solution 1 - Regex	Motti	View Answer on Stackoverflow
Solution 2 - Regex	fedorqui	View Answer on Stackoverflow
Solution 3 - Regex	Papa Smurf	View Answer on Stackoverflow

Negative matching using grep (match lines that do not contain foo)

Regex Problem Overview

Regex Solutions

Solution 1 - Regex

Solution 2 - Regex

Solution 3 - Regex

How do you remove all the options of a select box and then add one option and select it with jQuery?

What does the 'b' character do in front of a string literal?

Attributions