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POIssue with string replacing and regex
 

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  1. POIssue with string replacing and regex
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    <p>I am writing a function to convert urls to working links. This must convert every form: full url like <code>http://link.com</code>, without the protocol like <code>www.link.com</code>, even with just the extension like <code>link.com</code>.</p> <p>So far my function is working but there is a weird bug when there is several times the same link in a string.</p> <pre><code>import re import cgi def process_links(string): """Convert urls to links in a string""" # http + https links = re.findall("(https?://[^\s]+)", string) # www links2 = re.findall("(w{3}\.[^\s]+)", string) # only extension links3 = re.findall("([^\s]+\.[^\s]{2,})", string) links = links + links2 + links3 # remove duplicates links = list(set(links)) string = cgi.escape(string) for link in links: # make sure the href attr starts with http|https if re.match('https?://', link) is None: http_link = 'http://'+link else: http_link = link htmlLink = '&lt;a href="'+http_link+'"&gt;'+link+'&lt;/a&gt;' string = re.sub(link, htmlLink, string) return string </code></pre> <p>Working and failing examples:</p> <pre><code># working string = 'firstlink.com and www.secondlink.com' # output: # '&lt;a href="http://firstlink.com"&gt;firstlink.com&lt;/a&gt; and &lt;a href="http://www.secondlink.com"&gt;www.secondlink.com&lt;/a&gt; # failing: when there are several times the same link string = 'firstlink.com and http://firstlink.com # output: # &lt;a href="&lt;a href="http://firstlink.com"&gt;http://firstlink.com&lt;/a&gt;"&gt;firstlink.com&lt;/a&gt; and http://&lt;a href="&lt;a href="http://firstlink.com"&gt;http://firstlink.com&lt;/a&gt;"&gt;firstlink.com&lt;/a&gt; </code></pre> <p>I've never tried to use regex this "complicated" in python and can't figure out why there is this weird behavior. I think this comes from the <code>re.sub()</code> part where it may replace something that has already been replaced?</p> <p>PS: my function is probably not the best and can certainly be improved, if you have any suggestions I'm listening</p>
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    1. USromainberger
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    1. COThe first time through the loop, re.sub will replace *all* occurrences of firstlink.com with <a href="http://firstlink.com">firstlink.com</a>, and the second time through the loop, re.sub will replace *all* occurrences of http://firstlink.com with <a href="http://firstlink.com">http://firstlink.com</a>
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      1. POIssue with string replacing and regex
      1. USSam Ruby
 

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