How to check email address from display name and email address by comma seperated is valid or not?
<p><strong>How to i check email address from display name and email address by comma seperated is valid or not...</strong></p>

<pre><code>"a1 b.d"&lt;a1@test.com&gt;,  // this is valid
&lt;a2@test.com&gt;,   // this is valid
"a3 b.d"&lt;a3@test.com&gt; , // this is valid
a b.c a4@test.com ,   // this is not valid
"a1 b.d"&lt;a1@test.com&gt;,  // this is valid
&lt;a2test.com&gt;,   // this is not valid
"a3 b.d"&lt;a3@testcom&gt; , // this is not valid
" a b.c a4@test.com " ,   // this is not valid
</code></pre>

<p><strong>if overall is valid or not? how to check?</strong></p>
