ATWMICHEL

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Hi Kimputer,<br />
<br />
Brilliant.<br />
<br />
Thank You - <b>I like the lateral thinking and it works.</b><br />
<br />
Much Thanks.<br />
<br />
<br />
M.
</div>


Hi Kimputer,

Brilliant.

Thank You - I like the lateral thinking and it works.

Much Thanks.


M.

<div>
Excellent lateral thinking : &nbsp;didn't answer just the question asked - thought about the reason for the question and suggested a luminous simple solution that works.<br />
<br />
Thanks a million.<br />
<br />
M.
</div>


Excellent lateral thinking :  didn't answer just the question asked - thought about the reason for the question and suggested a luminous simple solution that works.

Thanks a million.

M.

<div>
<pre><code id="code-20-42729152-1">\@.*\@</code></pre>
<a href="https://regex101.com/r/2vyvcZ/1" rel="ugc">https://regex101.com/r/2vyvcZ/1</a>
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\@.*\@

https://regex101.com/r/2vyvcZ/1 [https://regex101.com/r/2vyvcZ/1]

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<div class="content wysiwyg-content">
Hello,<br />
<br />
<b>I am trying to write a regular expression for a spam filter that checks for &nbsp;@ &nbsp;appearing more than once in a string.</b><br />
<br />
Reason : &nbsp;there is a new type of file-less virus exploit that comes into our spam filter &nbsp;with two email addresses in the FROM field. &nbsp;The writers of the spam filter are working on producing a fix but in the meantime I want to write a rule which examines the FROM field and if it finds &nbsp;<b>more than 1 instance of &nbsp;&quot;@&quot;</b> &nbsp;in the string that is the FROM field, then the rule will reject that email.<br />
<br />
Thanks for any help on this.<br />
<br />
M.
</div>
</div>


Hello,

I am trying to write a regular expression for a spam filter that checks for  @  appearing more than once in a string.

Reason :  there is a new type of file-less virus exploit that comes into our spam filter  with two email addresses in the FROM field.  The writers of the spam filter are working on producing a fix but in the meantime I want to write a rule which examines the FROM field and if it finds  more than 1 instance of  "@"  in the string that is the FROM field, then the rule will reject that email.

Thanks for any help on this.

M.

Finding @ not less than twice in a string

A regular expression ("regex") is a sequence of characters that define a search pattern, mainly for use in pattern matching with strings, or string matching, i.e. "find and replace"-like operations. Regular expression processors are found in several search engines, search and replace dialogs of several word processors and text editors, and in the command lines of text processing utilities, such as sed and AWK. Many programming languages provide regular expression capabilities, some built-in, for example Perl, JavaScript, Ruby, AWK, and Tcl, and others via a standard library, for example .NET languages, Java, Python and C++ (since C++11). Most other languages offer regular expressions via a library.