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    <p>The dash character in your text is <a href="http://www.fileformat.info/info/unicode/char/2013/index.htm" rel="nofollow"><code>EN DASH U+2013</code></a>, that's why <code>([^-])</code> matches the <code>EN DASH</code> and a replacement occurs.</p> <p>You need to add the character into your character class, and shift the <code>\s*</code> to the first capturing group, and add <code>\s</code> to the negated character class to make it works as you want:</p> <pre><code>re.sub(r'([^\s–-]\s*)(&lt;br)',r'\1\n\2', astring) </code></pre> <p>Note that while the code above works, it is not maintainable - since it is very hard to notice the <code>EN DASH</code> in the character class.</p> <p>From <a href="http://docs.python.org/3.3/library/re.html" rel="nofollow">Python 3.3</a> and above, <code>\u</code> or <code>\U</code> Unicode escape sequence has been added. You can specify your regex as such:</p> <pre><code>re.sub(r'([^\s\u2013-]\s*)(&lt;br)',r'\1\n\2', astring) </code></pre> <p>It is arguably less clear what <code>\u2013</code> is, but at least, reader of the code won't get tripped.</p> <p>For Python 3.2 and below, you can use the normal literal string instead of raw literal string syntax for the regex to achieve the same effect.</p> <pre><code>re.sub('([^\\s\u2013-]\\s*)(&lt;br)',r'\1\n\2', astring) </code></pre> <p>Technically, due to Python's way of parsing literal string (preserve the <code>\</code> if it does not form a valid escape sequence), <code>'([^\s\u2013-]\s*)(&lt;br)'</code> also works (compare <code>\\s</code> and <code>\s</code>), but I double up the escape just to be safe.</p>
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    1. POFailure in finding '-<' substring using regex
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    1. CONice catch! Gets my +1
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      1. USBurhan Khalid
    2. COThis gets me every time, dammit! Instead of playing with those two characters, I have decided to first replace all the EN DASH `–` with hyphen `-`. Then, I would require only hyphen `-` in the regex.
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      1. USJayesh Bhoot
    3. COThis doesn't work when I have whitespace(s) in between `-` and `<br>`. Apparantly, `[^-]` would include whitespace, too, thus tearing down the regexp.
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