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POHalf-space in regex
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copied!<p>I am supposed to write a little program that takes in a Persian text and in some places changes the space to half-space. The half-space or a <a href="http://en.wikipedia.org/wiki/Zero-width_non-joiner" rel="nofollow">zero-width non-joiner</a> is used in some languages to avoid a <a href="http://en.wikipedia.org/wiki/Typographic_ligature" rel="nofollow">ligature</a> when normalizing a text. It's unicode character is supposedly <code>'\u200c'</code> and in some text-editors it can be shown on the screen with a SHIFT+SPACE:</p> <pre><code>import re txt = input('Please enter a Persian text: ') original_pattern = r'\b(\w+)\s*(ها|هايي|هايم|هاي)\b' new_pattern = r'\1 \2' new_txt = re.sub (original_pattern, new_pattern, txt) print (new_txt) </code></pre> <p>In the code above, <code>new_pattern</code> is supposed to introduce a half-space between <code>\1</code> and <code>\2</code>, currently there is a space between them.</p> <p>The question is: How can I put a half-space there? I tried the following and in both cases got a syntax error:</p> <pre><code>new_pattern = ur'\1\u200c\2' new_pattern = r'\1\u200c\2' </code></pre> <p>By the way, although in the Wikipedia article the unicode character for ZWNJ is given as U+200c, it doesn't seem to be working that way in the python shell and it is actually doubling the space:</p> <pre><code>>>> print ('He is a',u'\u200c','boy') He is a ‌ boy >>> print ("کتاب",u"\u200c","ها") کتاب ‌ ها >>> print ("کتاب ها") کتاب ها >>> </code></pre>

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