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run code in 200+ php & hhvm versions
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<?php $str = '<sas28utm>utm_campaign=write_review&utm_medium=email&utm_source=socialannex</sas28utm><table border="0" cellpadding="0" cellspacing="0" style="margin: 0 auto; width: 100%; margin: 0px auto;    max-width: 600px;" width="600">    <tbody>        <tr>            <td>&nbsp;</td>        </tr>        <tr>            <td align="center" valign="top"><img alt="" src="http://cdn.socialannex.com/custom_images/9396340/COV7Y3_logo.png" style="max-width:440px; width: 100%;margin: 0px auto;" /></td>        </tr>        <tr>            <td style="border-top:1px solid #aeaeae;">&nbsp;</td>        </tr>        <tr>            <td>&nbsp;</td>        </tr>        <tr>            <td align="center" style="font-family:Helvetica,Arial; font-size:30px; color:#000; text-transform: uppercase;" valign="top">Your Review<br />            Has Been Approved!</td>        </tr>        <tr>            <td>&nbsp;</td>        </tr>        <tr>            <td align="center" style="font-family:Helvetica,Arial; font-size:14px; color:#000;" valign="top">Thank you for your review. Please click on &ldquo;View Review&rdquo;<br />            below to see your approved review.</td>        </tr>        <tr>            <td>&nbsp;</td>        </tr>        <tr>            <td align="center" valign="top"><img alt="" height="250px" src="#productImageUrl#" width="268px" /></td>        </tr>        <tr>            <td>&nbsp;</td>        </tr>        <tr>            <td align="center" style="font-family:Helvetica,Arial; font-size:22px; color:#000; text-transform: uppercase;" valign="top">#productName#</td>        </tr>        <tr>            <td>&nbsp;</td>        </tr>        <tr>            <td>&nbsp;</td>        </tr>        <tr>            <td align="center" valign="top"><a href="#producturl##sas28utmtag#"><img alt="" src="http://cdn.socialannex.com/custom_images/9396340/CXGJEG_view.png" /></a></td>        </tr>        <tr>            <td height="60">&nbsp;</td>        </tr>        <tr>            <td align="center" style="background:#eaeaea;font-family:Helvetica,Arial; font-size:11px; color:#000; height:80px;" valign="middle">Many Thanks<br />            The Wilsons Leather Team</td>        </tr>    </tbody></table>'; $substr = substr($str, strpos($str, '<sas28utm>'), strpos($str, '</sas28utm>')); $utmtag = substr($substr, 10, strlen($substr)-21); echo $utmtag;
based on ZfIWc
Output for 5.6.0 - 5.6.30, hhvm-3.15.4, 7.0.0 - 7.3.0rc3
utm_campaign=write_review&utm_medium=email&utm_source=