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    copied!<p>This might be the solution you are lookin for:</p> <pre><code>from HTMLParser import HTMLParser class MyParser(HTMLParser): def __init__(self,link, keyword): HTMLParser.__init__(self) self.__html = [] self.link = link self.keyword = keyword def handle_data(self, data): text = data.strip() self.__html.append(text.replace(self.keyword,'&lt;a href="'+self.link+'&gt;'+self.keyword+'&lt;/a&gt;')) def handle_starttag(self, tag, attrs): self.__html.append("&lt;"+tag+"&gt;") def handle_endtag(self, tag): self.__html.append("&lt;/"+tag+"&gt;") def new_html(self): return ''.join(self.__html).strip() parser = MyParser("blah","keyword") parser.feed("&lt;div&gt;&lt;p&gt;Text with keyword here&lt;/p&gt;&lt;/div&gt;") parser.close() print parser.new_html() </code></pre> <p>This will give you the following output</p> <pre><code>&lt;div&gt;&lt;p&gt;Text with &lt;a href="blah&gt;keyword&lt;/a&gt; here&lt;/p&gt;&lt;/div&gt; </code></pre> <p>The problem with your lxml approach only seems to occur when the keywords has only a single nesting. It seems to work fine with multiple nestings. So I added an if condition to catch this exception.</p> <pre><code>from lxml.html import fragments_fromstring, fromstring, tostring from re import compile def markup_aware_sub(pattern, repl, text): exp = compile(pattern) root = fromstring(text) els = [el for el in root.getiterator() if el.text] els = [el for el in els if el.text.strip()] if len(els) == 1: el = els[0] text = exp.sub(repl, el.text) parent = el.getparent() new_el = fromstring(text) new_el.tag = el.tag for k, v in el.attrib.items(): new_el.attrib[k] = v return tostring(new_el) for el in els: text = exp.sub(repl, el.text) if text == el.text: continue parent = el.getparent() new_el = fromstring(text) new_el.tag = el.tag for k, v in el.attrib.items(): new_el.attrib[k] = v parent.replace(el, new_el) return tostring(root) print markup_aware_sub('keyword', '&lt;a&gt;blah&lt;/a&gt;', '&lt;p&gt;Text with keyword here&lt;/p&gt;') </code></pre> <p>Not very elegant, but seems to work. Please check it out.</p>
 

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