From 0052ec63ca70eaa6d9ffb1926c294dbfd85f8c05 Mon Sep 17 00:00:00 2001
From: Mohammad Sajid Anwar <mohammad.anwar@yahoo.com>
Date: Wed, 18 Sep 2024 20:18:52 +0100
Subject: - Added solutions by Paulo Custodio. - Added solutions by Peter
 Campbell Smith. - Added solutions by Robert Ransbottom. - Added solutions by
 Feng Chang. - Added solutions by PokGoPun. - Added solutions by Peter
 Pentchev. - Added solutions by Santiago Leyva. - Added solutions by Robbie
 Hatley. - Added solutions by Ulrich Rieke. - Added solutions by Laurent
 Rosenfeld.

---
 challenge-287/ulrich-rieke/cpp/ch-2.cpp | 22 ++++++++++++++++++++++
 1 file changed, 22 insertions(+)
 create mode 100755 challenge-287/ulrich-rieke/cpp/ch-2.cpp

(limited to 'challenge-287/ulrich-rieke/cpp/ch-2.cpp')

diff --git a/challenge-287/ulrich-rieke/cpp/ch-2.cpp b/challenge-287/ulrich-rieke/cpp/ch-2.cpp
new file mode 100755
index 0000000000..b5dc14d07a
--- /dev/null
+++ b/challenge-287/ulrich-rieke/cpp/ch-2.cpp
@@ -0,0 +1,22 @@
+#include <iostream>
+#include <string>
+#include <regex>
+
+int main( ) {
+   std::cout << "Enter a string!\n" ;
+   std::string word ;
+   std::cin >> word ;
+   std::string inte {R"(^[-+]?\d+([eE]?[-+]?\d+)*$)"} ;
+   std::string decifirst {R"(^[-+]?\d+\.([eE]?[-+]?\d+)*$|^[-+]?\d+\.\d+([eE]?[+-]?\d+)*$)"} ;
+   std::string decisecond {R"(^[+-]?\.\d+([eE]?[+-]?\d+$)*$)" } ;
+   std::regex integer( inte ) ;
+   std::regex decimalfirst ( decifirst ) ;
+   std::regex decimalsecond ( decisecond ) ;
+   if ( std::regex_match( word , integer ) || std::regex_match( word , decimalfirst ) ||
+      std::regex_match( word , decimalsecond ) )
+      std::cout << "true" ;
+   else 
+      std::cout << "false" ;
+   std::cout << '\n' ;
+   return 0 ;
+}
-- 
cgit