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    copied!<p>This ought to do it.</p> <pre><code>/* Assumptions: - Sentence separators are a combination of terminators (.!?) + doublequote (optional) + spaces + capital letter. - I haven't preserved tags if it gets down to removing the last sentence. */ function removeLastSentence(text) { lastSeparator = Math.max( text.lastIndexOf("."), text.lastIndexOf("!"), text.lastIndexOf("?") ); revtext = text.split('').reverse().join(''); sep = revtext.search(/[A-Z]\s+(\")?[\.\!\?]/); lastTag = text.length-revtext.search(/\/\&lt;/) - 2; lastPtr = (lastTag &gt; lastSeparator) ? lastTag : text.length; if (sep &gt; -1) { text1 = revtext.substring(sep+1, revtext.length).trim().split('').reverse().join(''); text2 = text.substring(lastPtr, text.length).replace(/['"]/g,'').trim(); sWithoutLastSentence = text1 + text2; } else { sWithoutLastSentence = ''; } return sWithoutLastSentence; } /* TESTS: var text = '&lt;p&gt;Blabla, some more text here. Sometimes &lt;span&gt;basic&lt;/span&gt; html code is used but that should not make the "selection" of the text any harder! I looked up the window and I saw a plane flying over. I asked the first thing that came to mind: "What is it doing up there?" She did not know, "I think we should move past the fence!", she quickly said. He later described it as: "Something insane. "&lt;/p&gt;'; alert(text + '\n\n' + removeLastSentence(text)); alert(text + '\n\n' + removeLastSentence(removeLastSentence(text))); alert(text + '\n\n' + removeLastSentence(removeLastSentence(removeLastSentence(text)))); alert(text + '\n\n' + removeLastSentence(removeLastSentence(removeLastSentence(removeLastSentence(text))))); alert(text + '\n\n' + removeLastSentence(removeLastSentence(removeLastSentence(removeLastSentence(removeLastSentence(text)))))); alert(text + '\n\n' + removeLastSentence(removeLastSentence(removeLastSentence(removeLastSentence(removeLastSentence(removeLastSentence(text))))))); alert(text + '\n\n' + removeLastSentence('&lt;p&gt;Blabla, some more text here. Sometimes &lt;span&gt;basic&lt;/span&gt; html code is used but that should not make the "selection" of the text any harder! I looked up the ')); */ </code></pre>
 

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