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    <p>I have something rather complicated, but I wrote it in hurry and for the moment it does the job.</p> <p>Note that:</p> <ul> <li><p>I added 'in France' after <strong>Meanwhile is the studio 7 album by British pop band 10cc</strong><br> and that only <strong>British</strong> is modified</p></li> <li><p>'1978' in <strong>by the german band Genesis 8 and was released in 1978</strong> isn't modified while the '8' is modified. </p></li> </ul> <p>That's the reason for which it is complicated.</p> <p>But I fear that,despite this complication, it won't be exact for all the sentences possible. </p> <p>Improvement should be done to make that <strong>idi</strong> would always be the correct musical group's name, and not always the first one as it is in this present solution. But it's a hard work without knowing what you exactly want</p> <pre><code>ss ='''british 7 German 8 France 90''' text = '''&lt;s id="69-7"&gt;...Meanwhile is the studio 7 album by British pop band 10cc in France.&lt;/s&gt; &lt;s id="15-8"&gt;...And Then There Were Three... is the ninth studio album by the german band Genesis 8 and was released in 1978.&lt;/s&gt; &lt;s id="1990-2"&gt;Magnum Nitro Express is a France centerfire fire rifle cartridge 90.&lt;/s&gt; ''' import re regx = re.compile('^(.+?)[ \t]+(\d+)',re.MULTILINE) dico = dict((a.lower(),b) for (a,b) in regx.findall(ss)) print 'dico==',dico print '\n\n' rogx = re.compile('(&lt;s id="[\d-]+"&gt;|&lt;/s&gt;\r?\n)') splitted = rogx.split(text) print 'splitted==\n',splitted print '=================\n' def repl(mat): idi = (b for (a,b) in the if b).next().lower() x,y = mat.groups() if x: if dico[idi.lower()]==x: return '&lt;w2&gt;%s&lt;/w2&gt;' % x else: return x if y : if y.lower()==idi: return '&lt;w1&gt;%s&lt;/w1&gt;' % y else: return y rigx = re.compile('(\d+)|(' + '|'.join(dico.keys()) + ')',re.IGNORECASE) for i,el in enumerate(splitted[0::2]): if el: print '-----------------------------' print '* index in splitted==',2*i print '\n* el==\n',repr(el) print '\n* rigx.findall(el)==\n',rigx.findall(el) the = rigx.findall(el) print '\n* modified el:\n',rigx.sub(repl,el) splitted[2*i] = rigx.sub(repl,el) print '\n\n##################################\n\n' print 'modified splitted==\n',splitted print print ''.join(splitted) </code></pre> <p>result</p> <pre><code>dico== {'german': '8', 'british': '7', 'france': '90'} splitted== ['', '&lt;s id="69-7"&gt;', '...Meanwhile is the studio 7 album by British pop band 10cc in France.', '&lt;/s&gt;\n', '', '&lt;s id="15-8"&gt;', '...And Then There Were Three... is the ninth studio album by the german band Genesis 8 and was released in 1978.', '&lt;/s&gt;\n', '', '&lt;s id="1990-2"&gt;', 'Magnum Nitro Express is a France centerfire fire rifle cartridge 90.', '&lt;/s&gt;\n', ''] ================= ----------------------------- * index in splitted== 2 * el== '...Meanwhile is the studio 7 album by British pop band 10cc in France.' * rigx.findall(el)== [('7', ''), ('', 'British'), ('10', ''), ('', 'France')] * modified el: ...Meanwhile is the studio &lt;w2&gt;7&lt;/w2&gt; album by &lt;w1&gt;British&lt;/w1&gt; pop band 10cc in France. ----------------------------- * index in splitted== 6 * el== '...And Then There Were Three... is the ninth studio album by the german band Genesis 8 and was released in 1978.' * rigx.findall(el)== [('', 'german'), ('8', ''), ('1978', '')] * modified el: ...And Then There Were Three... is the ninth studio album by the &lt;w1&gt;german&lt;/w1&gt; band Genesis &lt;w2&gt;8&lt;/w2&gt; and was released in 1978. ----------------------------- * index in splitted== 10 * el== 'Magnum Nitro Express is a France centerfire fire rifle cartridge 90.' * rigx.findall(el)== [('', 'France'), ('90', '')] * modified el: Magnum Nitro Express is a &lt;w1&gt;France&lt;/w1&gt; centerfire fire rifle cartridge &lt;w2&gt;90&lt;/w2&gt;. ################################## modified splitted== ['', '&lt;s id="69-7"&gt;', '...Meanwhile is the studio &lt;w2&gt;7&lt;/w2&gt; album by &lt;w1&gt;British&lt;/w1&gt; pop band 10cc in France.', '&lt;/s&gt;\n', '', '&lt;s id="15-8"&gt;', '...And Then There Were Three... is the ninth studio album by the &lt;w1&gt;german&lt;/w1&gt; band Genesis &lt;w2&gt;8&lt;/w2&gt; and was released in 1978.', '&lt;/s&gt;\n', '', '&lt;s id="1990-2"&gt;', 'Magnum Nitro Express is a &lt;w1&gt;France&lt;/w1&gt; centerfire fire rifle cartridge &lt;w2&gt;90&lt;/w2&gt;.', '&lt;/s&gt;\n', ''] &lt;s id="69-7"&gt;...Meanwhile is the studio &lt;w2&gt;7&lt;/w2&gt; album by &lt;w1&gt;British&lt;/w1&gt; pop band 10cc in France.&lt;/s&gt; &lt;s id="15-8"&gt;...And Then There Were Three... is the ninth studio album by the &lt;w1&gt;german&lt;/w1&gt; band Genesis &lt;w2&gt;8&lt;/w2&gt; and was released in 1978.&lt;/s&gt; &lt;s id="1990-2"&gt;Magnum Nitro Express is a &lt;w1&gt;France&lt;/w1&gt; centerfire fire rifle cartridge &lt;w2&gt;90&lt;/w2&gt;.&lt;/s&gt; </code></pre> <h2>EDIT 1</h2> <p>I eliminated replmodel()</p> <p>repl() takes the value of the rigx.findall(el)<br> I added a line <strong>the = rigx.findall(el)</strong> for that</p>
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    1. COThank you! Is there something simple just to ignore `<s id="69-7">` while matching string?
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    2. CO@Liza Yes, it consists to eliminate parens in the regex' pattern. But if you do that, you can't do join() on the splitted string to obtain the modified string: it will lack the splitters. That's why I keep the splitters and I am obliged to play with indexes (2*i)
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    3. CO@eyquem, your solution is nice and really exquisite. But it is highly overengineered. Sometimes it is better to have 3 lines of code that handles 99.9% of input, than 50 lines, that handles 100%. One should move to such variants only when the necessity is proved. +1 anyway.
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