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    <p>If you are searching a list of URLs </p> <pre><code>urls = [ 'http://some.link.com/path/to/file.jpg', 'http://some.link.com/path/to/another.png', 'http://and.another.place.com/path/to/not-image.txt', ] </code></pre> <p>to find ones that match a given pattern you can use:</p> <pre><code>import re for url in urls: if re.match(r'http://.*(jpg|png|gif)$'): print url </code></pre> <p>which will output</p> <pre class="lang-none prettyprint-override"><code>http://some.link.com/path/to/file.jpg http://some.link.com/path/to/another.png </code></pre> <p><code>re.match()</code> will test for a match at the start of the string and return a <em>match object</em> for the first two links, and <code>None</code> for the third.</p> <p>If you are getting just the extension, you can use the following:</p> <pre><code>for url in urls: m = re.match(r'http://.*(jpg|png|gif)$') print m.group(0) </code></pre> <p>which will print</p> <pre class="lang-none prettyprint-override"><code>('jpg',) ('png',) </code></pre> <p>You will get just the extensions because that's what was defined as a group.</p> <p>If you need to find the url in a long string of text (such as returned from wget), you need to use <code>re.search()</code> and enclose the part you are interested in with <code>( )</code>'s. For example, </p> <pre><code>response = """dlkjkd dkjfadlfjkd fkdfl kadfjlkadfald ljkdskdfkl adfdf kjakldjflkhttp://some.url.com/path/to/file.jpgkaksdj fkdjakjflakdjfad;kadj af kdlfjd dkkf aldfkaklfakldfkja df""" reg = re.search(r'(http:.*/(.*\.(jpg|png|gif)))', response) print reg.groups() </code></pre> <p>will print</p> <pre class="lang-none prettyprint-override"><code>('http://some.url.com/path/to/file.jpg', 'file.jpg', 'jpg',) </code></pre> <p>or you can use <code>re.findall</code> or <code>re.finditer</code> in place of <code>re.search</code> to get all of the URL's in the long response. Search will only return the first one.</p>
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