c# - Regular expression to parse AT command response -

i trying return message @ command response.

this input:

at+cusd=1,"*124#",15

ok

+cusd: 2,"00302220100 main balance 10k, valid until 23/10/2015. more balance details, please send bal 1"

my expected result is:

00302220100 main balance 10k, valid until 23/10/2015. more balance details, please send bal 1

here code:

    private string parsemessages_chkcredit(string input)     {         string messages = "";         regex r = new regex("\\at+cusd: (\\d+),\"(.*?)\"", regexoptions.singleline);         match m = r.match(input);         while (m.success)         {             messages = m.groups[2].value.tostring();             break;         }         return messages;     } 

the regular expression not match. please kindly me. lot.

(?<=at\+[\s\s]*?cusd:[^"]*")[^"]* 

you can make use variable lookbehind.see demo.

string strregex = @"(?<=at\+[\s\s]*?cusd:[^""]*"")[^""]*"; regex myregex = new regex(strregex, regexoptions.none); string strtargetstring = @"at+cusd=1,""*124#"",15" + "\n" + @"ok" + "\n\n" + @"+cusd: 2,""00302220100 main balance 10k, valid until 23/10/2015. more balance details, please send bal 1""" + "\n";  foreach (match mymatch in myregex.matches(strtargetstring)) {   if (mymatch.success)   {     // add code here   } }