$re = '/<span class=\"_c1 ei_card_subtitle _c1\">.*?([\dX]+).*?<\/span>/';
$str = '<body class="default-theme des-mat" style="background: rgb(255, 255, 255);"><div id="prpd"></div><div class="" id="mngb"><div id="gb" class="gb_T"><div class="gb_nb gb_Lg gb_R gb_Kg gb_Og gb_T" style="min-width: 241px;"><div class="gb_oe gb_R gb_Lg gb_Bg"><div class="gb_Q gb_R gb_S gb_Lg"><span class="_c1 ei_card_subtitle _c1">Name<br /> 713286XXX971 - 12021980</span>/div><div class="gb_Q gb_R"><a class="gb_P" data-pid="23" href="https://mail.google.com/mail/?authuser=0">Gmail</a></div><div class="gb_Q gb_R"><a class="gb_P" data-pid="2" href="https://www.google.com/imghp?hl=en&authuser=0">Images</a></div></div><div class="gb_Ec gb_Lg gb_R" style="min-width: 120px;"><div class="gb_fa" id="gbsfw" style="background-color:#eee;min-width:376px"><iframe ng-non-bindable="" frameborder="0" hspace="0" marginheight="0" marginwidth="0" scrolling="no" style="width: 376px; height: 380px;" tabindex="0" vspace="0" width="100%" class="gb_9b" allowtransparency="true" aria-hidden="true" id="I0_1523641321551" name="I0_1523641321551" src="https://notifications.google.com/u/0/widget?sourceid=243&hl=en&origin=https%3A%2F%2Fwww.google.com&uc=1&usegapi=1&jsh=m%3B%2F_%2Fscs%2Fabc-static%2F_%2Fjs%2Fk%3Dgapi.gapi.en.DgOlXVbWcXc.O%2Fm%3D__features__%2Frt%3Dj%2Fd%3D1%2Frs%3DAHpOoo-riybzrJ8O_UpInxWO1d1OWu1FtA#pid=243&_methods=onError%2ConInfo%2ChideNotificationWidget%2CpostSharedMessage%2Creauth%2CsetNotificationWidgetHeight%2CsetNotificationWidgetSize%2CswitchTo%2CnavigateTo%2CsetNotificationText%2CsetNotificationAnimation%2CgetNotificationText%2CvalidateUser%2C_ready&id=I0_1523641321551&_gfid=I0_1523641321551&parent=https%3A%2F%2Fwww.google.com&pfname=&rpctoken=13573360"></iframe></div><div class="gb_da gb_9c gb_R" id="gbwa"><div class="gb_Qc"><a class="gb_b gb_hc" href="https://www.google.com/intl/en/options/" title="Google apps" aria-expanded="false" role="button" tabindex="0"></a><div class="gb_wb"></div></body>';
preg_match_all($re, $str, $matches, PREG_SET_ORDER, 0);
// Print the entire match result
var_dump($matches);
Please keep in mind that these code samples are automatically generated and are not guaranteed to work. If you find any syntax errors, feel free to submit a bug report. For a full regex reference for PHP, please visit: http://php.net/manual/en/ref.pcre.php