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thanks for code and explanation about the characters that do not need to be escaped
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thanks for code and explanation about the characters that do not need to be escaped

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<div class="content wysiwyg-content">
can you have this pattern work for both<br />
&lt;div class=3D&quot;gmail_quote&quot;&gt;<br />
&lt;div class=&quot;gmail_quote&quot;&gt;<br />
<br />

<pre><code id="code-10-28021982-1">$body='
Give me advance warning so I can ta=
ke the day off.&lt;br&gt;&lt;br&gt;&lt;div class=3D&quot;gmail_quote&quot;&gt;On Mon, Jan 2, 2012 at 12=
:39 AM
';


$body='
Give me advance warning so I can ta=
ke the day off.&lt;br&gt;&lt;br&gt;&lt;div class=&quot;gmail_quote&quot;&gt;On Mon, Jan 2, 2012 at 12=
:39 AM
';


$string = '&lt;div class=3D&quot;gmail_quote&quot;&gt;';
$pattern = preg_quote($string, &quot;#&quot;); #escape special characters, and the # character for use as the delimiter
$new_body = preg_replace(&quot;#^(.*?){$pattern}.*#s&quot;, &quot;$1&quot;, $body);

print $new_body;</code></pre>
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can you have this pattern work for both
<div class=3D"gmail_quote">
<div class="gmail_quote">

(CODE)

3D &quot; pattern and &quot; pattern

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.

Regular Expressions

PHP is a widely-used server-side scripting language especially suited for web development, powering tens of millions of sites from Facebook to personal WordPress blogs. PHP is often paired with the MySQL relational database, but includes support for most other mainstream databases. By utilizing different Server APIs, PHP can work on many different web servers as a server-side scripting language.

3D &quot; pattern and &quot; pattern

3D " pattern and " pattern