Regex extract numbers from Url (except port number)

Question

i have to extract id value of a product from url.

It is SEO Friendly (url routing).

Url can be

http://www.example.com/{param0}/{param1}/123/{param2}/{paramN}

Or

http://localhost:6847/{param0}/{param1}/123/{param2}/{paramN}

For the first url there is no problem. But for the second i want to extract ONLY the 123 or (ID) <-(It is an Integer).

I know that if i want to extract only numbers i can use

[0-9]+

but how can i tell regengine how to get all the numerical data from url except numbers that may have

before. i use :

((!:)[0-9]+)

it is not correct. Every advice is wellcamed:)

Thank you.

score 1 · Accepted Answer · 2011-09-28 04:16:00Z

1

There needs to be more info on what delimits the 123 in your example.

On its face, (?<!:)[0-9]+ will find the first clump of digits NOT preceded by ':'

Edit Probably for more accuracy, this (?<!:\d+)[0-9]+ would be better.
Note this is if .NET allows variable length look-behind (I think it does).

For fixed length look-behind (PCRE), something like this might work: (?<![:\d])[0-9]+

Edit2

@Sanosay- After thinking about .NET type lookbehinds, the above regex needs a slight change. It should be (?<!:\d*)[0-9]+ . Thats because in ':1234', 1 will satisfy the assertion.

Hope you figured this to be the case. I made a test case for the two regex's
@"(?<!:\d*)[0-9]+"
@"(?<![:\d])[0-9]+"
that satisfy the conditions.

The link to the ideone C# code is here: http://ideone.com/tLn2j

edited Sep 28, 2011 at 4:16

answered Sep 25, 2011 at 18:46

user557597

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2 Comments

Sanosay Over a year ago

The 123 is for example an ID of a product (only int). I will test your solution..i think that it will work:)

Sanosay Over a year ago

:/ It is not working. (i think i have test that solution before). Ouput for localhost:14964/rToz/product/311/Testing : 4964

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