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copied!<p>Your expression is working just fine; Python is just showing you a <em>string literal</em> instead, where you'd have to escape quotes to be able to re-use it as a python string.</p> <p>If you print the value, no such escaping takes place:</p> <pre><code>>>> re.sub( 'src=\"(.+)\"', 'src="{{ \'\\1\' | asset_url }}"', test, flags=re.MULTILINE ) '\n <script type="text/javascript" src="{{ \'./js/jquery-1.8.3.min.js\' | asset_url }}"></script>\n \n <script type="text/javascript" src="{{ \'./js/ie-amendments.js\' | asset_url }}"></script>\n <script type="text/javascript" src="{{ \'./js/jquery.bxslider.min.js\' | asset_url }}"></script>\n <script type="text/javascript" src="{{ \'./js/jquery.colorbox-min.js\' | asset_url }}"></script>\n <script type="text/javascript" src="{{ \'./js/main.js\' | asset_url }}"></script>\n' >>> print(re.sub( 'src=\"(.+)\"', 'src="{{ \'\\1\' | asset_url }}"', test, flags=re.MULTILINE )) <script type="text/javascript" src="{{ './js/jquery-1.8.3.min.js' | asset_url }}"></script>  <script type="text/javascript" src="{{ './js/ie-amendments.js' | asset_url }}"></script> <script type="text/javascript" src="{{ './js/jquery.bxslider.min.js' | asset_url }}"></script> <script type="text/javascript" src="{{ './js/jquery.colorbox-min.js' | asset_url }}"></script> <script type="text/javascript" src="{{ './js/main.js' | asset_url }}"></script> </code></pre> <p>You can use <code>?</code> to make <code>+</code>, <code>*</code> and <code>?</code> qualifiers <em>non-greedy</em>; matching the minimum instead of the maximum. You can also match anything that is <em>not</em> a quote instead:</p> <pre><code>r'src="([^"]+)"' </code></pre> <p>which constrains that part of the regular expression much better; <code>[^"]</code> matches any character that is <em>not</em> a double quote.</p> <p>When specifying a regular expression pattern, it is generally a good idea to use a python raw string literal (<code>r''</code>) instead, saves a lot of headaches as to what needs escaping and what does not. Using a raw string literal, your substitution pattern can be simplified to:</p> <pre><code>r'src="{{ \'\1\' | asset_url }}"' </code></pre> <p>for a final line of:</p> <pre><code>re.sub(r'src="([^"]+)"', r'src="{{ \'\1\' | asset_url }}"', test, flags=re.MULTILINE) </code></pre>

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