how to write a regex for this expression?

url1 = http://xyz.com/abc
url2 = http://xyz.com//abc

I want to write a re开发者_开发技巧gex that validate both url1 and url2

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Why not just use urlparse instead?

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http://\w+\.\w+//?\w+

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The answer depends on whether you want to parse urls in general or whether you just wonder how to handle the optional slash.

In the first case, I agree with Amber that you should use urlparse.

In the second case, use a ? after the slash in your expression:

http://xyz.com//?abc

A ? in a regular expression means that the previous element is optional (i.e. may appear zero times or once).

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You can use this regex:

\w{4}\:\/{2}\w+\.\w+\/{1,2}\w+

explanation:

\w{4} match any word character [a-zA-Z0-9_]
    Quantifier: Exactly 4 times
\: matches the character : literally
\/{2} matches the character / literally
    Quantifier: Exactly 2 times
\w+ match any word character [a-zA-Z0-9_]
    Quantifier: Between one and unlimited times, as many times as possible, giving back as needed
\. matches the character . literally
\w+ match any word character [a-zA-Z0-9_]
    Quantifier: Between one and unlimited times, as many times as possible, giving back as needed
\/{1,2} matches the character / literally
    Quantifier: Between 1 and 2 times, as many times as possible, giving back as needed 
\w+ match any word character [a-zA-Z0-9_]
    Quantifier: Between one and unlimited times, as many times as possible, giving back as needed

hope this helps.