[Regex] some ready-to-use patterns in Regex::Pattern: number, dec_octet, ipv4_addr

include/yat/regex/Regex.h

@@ -134,6 +134,7 @@
 namespace yat
 {
 
+
 // ============================================================================
 //! \class Regex
 //! \brief Wrapper over the GNU Regular expression processor
@@ -147,6 +148,14 @@ class YAT_DECL Regex
 {
 public:
 
+  //! Some basic patterns
+  struct Pattern
+  {
+    static const String number;     //! real number with or without exposant
+    static const String dec_octet;  //! decimal octet (integer number in [0-255])
+    static const String ipv4_addr;  //! ipv4 address (dec_octet.dec_octer.dec_octet.dec_octet)
+  };
+
   enum CompFlags
   {
     basic = 1,

src/regex/Regex.cpp

@@ -67,6 +67,12 @@ typedef YAT_WEAK_PTR(::regex_t) CompiledRegexWPtr;
   Mutex  Regex::s_mtx;
 #endif
 
+const std::string _DEC_OCTET     = "([0-9]|[1-9][0-9]|1[0-9][0-9]|2[0-4][0-9]|25[0-5])";
+
+const String Regex::Pattern::number    = R"([\+\-]?([0-9]+|\.[0-9]+|[0-9]+\.|[0-9]+\.[0-9]+)([eE][\+\-]?[0-9]+)?)";
+const String Regex::Pattern::dec_octet = _DEC_OCTET;
+const String Regex::Pattern::ipv4_addr = _DEC_OCTET + R"(\.)" + _DEC_OCTET + R"(\.)" + _DEC_OCTET + R"(\.)" + _DEC_OCTET;
+
 // ============================================================================
 // class RegexCache
 // Simple FIFO cache