Regular expression to convert url parameter string into path

Question

Need regular expression to change below url

abc.aspx?str=blue+lagoon&id=1234

to

/blog/blue-lagoon/

in what language? This seems like innapropriate regex to me, more info please. — Paul Creasey
– Paul Creasey, Commented Dec 9, 2009 at 23:25
If it is indeed an URL, then abc.aspx?id=1234&str=blue+lagoon is a legal equivalent and should be considered as well. — Pavel Minaev
– Pavel Minaev, Commented Dec 9, 2009 at 23:25
Also, as worded, it is not clear why regex is needed at all here - sounds like a straightforward search & replace. — Pavel Minaev
– Pavel Minaev, Commented Dec 9, 2009 at 23:27
Basically an expression to strip the string between "=" and "&" (For the above example--> blue+laggon) from the url and then add another string to it. — aloo
– aloo, Commented Dec 9, 2009 at 23:30
I need to pass the Regular expression to a CMS server for doing regex aliasing — aloo
– aloo, Commented Dec 9, 2009 at 23:31

zen · Accepted Answer · 2009-12-10 00:48:05Z

5

in perl:

my $work_url = $original_url; 
$work_url =~ s/\+/-/g;
$url = '/blog/' . do { $work_url =~ m/\bstr=([\w\-]+)\b/; $1} . '/';

works for the example given.

inspired by Ragepotato:

$new_url = '/blog/'
    . sub { local $_ = shift; tr/+/-/; m/\bstr=([\w\-]+)\b/; $1 }->($orig_url)
    . '/';

And an stricter, less greedy regex for Ragepotatos post, untested:

Regex.Match(input.Replace("+", "-"),@"\bstr=(.*?)&").Groups[1].Value

edited Dec 10, 2009 at 0:48

answered Dec 9, 2009 at 23:33

zen

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2 Comments

zen Over a year ago

You're welcome. I'm sorry I don't know C#.net syntax yet or I'd be happy to post. I'm sure the regex would look similar, but the invocation..? I'll read up a bit and see if I can wing it w/o a compiler.

zen Over a year ago

This might get you close.. Syntax snagged from: radsoftware.com.au/articles/regexsyntaxadvanced.aspx using System.Text.RegularExpressions; Regex exp = new Regex( @"\bstr=([\w\+]+)\b" ); string InputText = "abc.aspx?str=blue+lagoon&id=1234"; MatchCollection MatchList = exp.Matches(InputText); Match FirstMatch = MatchList[0]; Console.WriteLine(FirstMatch.Value);

Ragepotato · Accepted Answer · 2009-12-09 23:52:41Z

2

C# .NET

string input = "abc.aspx?str=blue+lagoon&id=1234";

string output = "/blogs/" + Regex.Match(input.Replace("+", "-"),@"str=(.*)&").Groups[1].Value + "/";

answered Dec 9, 2009 at 23:52

Ragepotato

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1 Comment

zen Over a year ago

nicely done. Needs a word boundary on the str and a non greedy capture (.*?) don't you think?

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