JSFiddle - React, Tailwind, and code Playground
JavaScript
var regex = /<([a-z][a-z0-9]*)[^>]*?(\/?)>/i
, body = '<title>Ololo - text’s life</title><div class="page-wrap"><div class="ng-scope"><div class="modal custom article ng-scope in" id="new-article" aria-hidden="false" style="display: block;"><div class="modal-dialog first-modal-wrapper">< div class="modal-content"><div class="modal-body full long"><div class="form-group">olololo<ul style="color: rgb(85, 85, 85);background-color: rgb(255, 255, 255);"><li>texttext</li><li>Filter the events lists by host.</li><li>Create graphs for separate hosts and for the groups of hosts.</li></ul><p style="color: rgb(85, 85, 85);background-color: rgb(255, 255, 255);">bbcvbcvbcvbcvbcvbcvbcvb</p></div></div></div></div></div></div><title>cvbcbcvbcvbcvbccb</title><div class="page-wrap"></div></div>'
, result = body.replace(regex, '')
alert(result);