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The regex pattern, broken down:<br />

<pre><code id="code-20-40252442-1">(?i)  ignore case
\. match a literal . character
(gif|jpe?g|png) match any one of gif or jpg or jpeg or png
$ match the end of the string</code></pre>
So to summarise it means to match a file with name ending in .gif, .jpg, .jpeg or .png.
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The regex pattern, broken down:


(?i)  ignore case
\. match a literal . character
(gif|jpe?g|png) match any one of gif or jpg or jpeg or png
$ match the end of the string

So to summarise it means to match a file with name ending in .gif, .jpg, .jpeg or .png.

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(?i) What does this mean? I think it means match any word regardless of case.<br />
<br />
ForceType application/octet-stream<br />
Header set Content-Disposition attachment<br />
&lt;FilesMatch &quot;(?i)\.(gif|jpe?g|png)$&quot;&gt;<br />
&nbsp; &nbsp; ForceType none<br />
&nbsp; &nbsp; Header unset Content-Disposition<br />
&lt;/FilesMatch&gt;<br />
Header set X-Content-Type-Options nosniff
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(?i) What does this mean? I think it means match any word regardless of case.

ForceType application/octet-stream
Header set Content-Disposition attachment
<FilesMatch "(?i)\.(gif|jpe?g|png)$">
    ForceType none
    Header unset Content-Disposition
</FilesMatch>
Header set X-Content-Type-Options nosniff

(?i) What does this mean? I think it means match any word regardless of case.

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.