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POSpecial Character problem in regexp by python
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  1. POSpecial Character problem in regexp by python
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    copied!<p>I apply some regular expression on xml file to find and replace values. Normally it works.(I heard the voices saying "use xml parsers". Meanwhile I can not.) But if there is a special character in the value, it ruins everything. </p> <p>Think I have a xml file like below:</p> <pre><code>&lt;fieldset&gt; &lt;idle1&gt; &lt;value&gt;something\\n&lt;/value&gt; &lt;/idle1&gt; &lt;idle2&gt; &lt;value&gt;blabla&lt;/value&gt; &lt;/idle2&gt; &lt;/fieldset&gt; </code></pre> <p>If I try to replace value in "<code>&lt;idle2&gt;&lt;value&gt;</code>" node, value of "<code>&lt;idle1&gt;&lt;value&gt;</code>" node becomes "something\n". And when it comes to writing to file, xml becomes:</p> <pre><code> &lt;fieldset&gt; &lt;idle1&gt; &lt;value&gt;something &lt;/value&gt; &lt;/idle1&gt; &lt;idle2&gt; &lt;value&gt;blabla&lt;/value&gt; &lt;/idle2&gt; &lt;/fieldset&gt; </code></pre> <p>Well both in search and replace i use "r" string literal. But it seems not working. I solve the problem. For every search and replace, I replace "\n"s with "<code>\\n</code>" and then I write result to the file. But it is not an efficient way to use. </p> <p>Is there something I could not see? I just want to write "<code>\\n</code>" to the files. Is this so much for me to want it?</p> <p>Edit: here is my regexs':</p> <p>for search :</p> <pre><code>self.searchPattern=(&lt;fieldset&gt;)(.*?)(&lt;idle2&gt;)(.*?)(&lt;value&gt;)(.*?)(&lt;/value&gt;)(.*?)(&lt;/idle2&gt;)(.*?)(&lt;/fieldset&gt;) </code></pre> <p>for replace : </p> <pre><code>self.replacePattern=`\g&lt;1&gt;\g&lt;2&gt;\g&lt;3&gt;\g&lt;4&gt;&lt;value&gt;denemeasdasd\\\\n&lt;/value&gt;\g&lt;8&gt;\g&lt;9&gt;\g&lt;10&gt;\g&lt;11&gt;` </code></pre> <p>this is the python code for search:</p> <pre><code>self.pattern = re.compile(r''''''+self.searchPattern+'''''', flags = re.S | re.U) </code></pre> <p>and this is for replacing</p> <pre><code>outtext = self.pattern.sub(r''''''+self.replacePattern+'''''',r''''''+self.match.group(0)+'''''') </code></pre>
 

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