URL Replacement

Question

Hi, I need a solution for the following scenario. I have two urls like: string browserURL = " /spm/kpi-setup/view/ {spmkpiinstance}/preventative-analysis"; string tobeInjecetedURL = " /spm/kpi-setup/view /40526/corrective-actions/"; My requirement: Need to check if the browserURL is equivalent with tobeInjecetedURL (highlighted in yellow). i.e : Need to check if the url matches just before the curly braces. if it matches then I need to replace the {spmkpiinstance} with value 40526. Please suggest a generic solution for this .

Vulpes · Answer

In the second and third cases, since what you're trying to match is not immediately followed by an opening curly bracket, how do you know what you're trying to match? For example in the second case, how do you know you're trying to match '/spm/kpi-setup/view/' and not '/spm/kpi-setup/' or '/spm/kpi-setup/view/preventative-analysis/' ? Also, if it's not adjacent to what you're trying to match, how do you know what the replacement is? For example in the third case, how do you know it's '40526' and not 'corrective-actions' ?

Praveen Raveendran Pillai · Answer

Thanks for your solution..But it is not a generic solution. Need to handle many cases. Case 1: string browserURL = " /spm/kpi-setup/view/ {spmkpiinstance}/preventative-analysis/"; string tobeInjecetedURL = " /spm/kpi-setup/view /40526/corrective-actions/"; Case 2: string browserURL = " / {spmkpiinstance} /spm/kpi-setup/view /preventative-analysis/"; string tobeInjecetedURL = " /40526 /spm/kpi-setup/view /corrective-actions/"; Case 3: string browserURL = " /spm/kpi-setup/view /preventative-analysis / {spmkpiinstance}/ "; string tobeInjecetedURL = " /spm/kpi-setup/view /corrective-actions /40526/ ";

Vulpes · Answer

Incidentally, if you want to know whether there was a match or not, you could change the URLReplace method so that it returns a bool rather than void: using System; using System.Text.RegularExpressions; class Test { static void Main() { string[] browserURLs = { "/spm/kpi-setup/view/{spmkpiinstance}/preventative-analysis", "/ spX /kpi-setup/view/{spmkpiinstance}/preventative-analysis", }; // second element won't match string tobeInjectedURL = "/spm/kpi-setup/view/40526/corrective-actions/"; for(int i = 0; i { bool success = URLReplace(ref browserURLs[i], tobeInjectedURL); if (success) { Console.WriteLine("A match was found. BrowerURL changed to"); } else { Console.WriteLine("A match was not found. BrowerURL still"); } Console.WriteLine(browserURLs[i]); Console.WriteLine(); } Console.ReadKey(); } static bool URLReplace(ref string browserURL, string tobeInjectedURL) { string regExp = @"^(.*?)(\{.*?})(.*)$"; Match m = Regex.Match(browserURL, regExp); string start = m.Groups[1].Value; if (tobeInjectedURL.StartsWith(start)) { int len = start.Length; int index = tobeInjectedURL.IndexOf('/', len); string replacement = tobeInjectedURL.Substring(len, index - len); browserURL = start + replacement + m.Groups[3].Value; return true; } return false; } } The output now is: A match was found. BrowerURL changed to /spm/kpi-setup/view/40526/preventative-analysis A match was not found. BrowerURL still /spX/kpi-setup/view/{spmkpiinstance}/preventative-analysis

Vulpes · Answer

Try this: using System; using System.Text.RegularExpressions; class Test { static void Main() { string browserURL= "/spm/kpi-setup/view/{spmkpiinstance}/preventative-analysis"; string tobeInjectedURL = "/spm/kpi-setup/view/40526/corrective-actions/"; URLReplace(ref browserURL, tobeInjectedURL); Console.WriteLine(browserURL); Console.ReadKey(); } static void URLReplace(ref string browserURL, string tobeInjectedURL) { string regExp = @"^(.*?)(\{.*?})(.*)$"; Match m = Regex.Match(browserURL, regExp); string start = m.Groups[1].Value; if (tobeInjectedURL.StartsWith(start)) { int len = start.Length; int index = tobeInjectedURL.IndexOf('/', len); string replacement = tobeInjectedURL.Substring(len, index - len); browserURL = start + replacement + m.Groups[3].Value; } } } The output should be: /spm/kpi-setup/view/40526/preventative-analysis