cwText.h/cpp : Added firstMatchChar(0 and lastMatchChar().

cwText.cpp

@@ -82,6 +82,35 @@ const char* cw::nextNonWhiteChar( const char* s )
 const char* cw::nextNonWhiteCharEOS( const char* s )
 { return _nextNonWhiteChar(s,true); }
 
+const char* cw::firstMatchChar( const char* s, char c )
+{
+  if( s == nullptr )
+    return nullptr;
+  
+  for(; *s; ++s)
+    if(*s == c)
+      return s;
+  return nullptr;
+}
+
+const char* cw::lastMatchChar( const char* s, char c )
+{
+  unsigned sn;
+  
+  if( s == nullptr )
+    return nullptr;
+  
+  sn = textLength(s);
+  if( sn == 0 )
+    return nullptr;
+  
+  for(const char* s1=s+(sn-1); s<=s1; --s1)
+    if( *s1 == c )
+      return s1;
+    
+  return nullptr;
+}
+
 bool cw::isInteger( const char* s )
 {
   for(; *s; ++s)

cwText.h

@@ -36,6 +36,11 @@ namespace cw
   // or nullptr if 's' is null.
   const char* nextNonWhiteCharEOS( const char* s );
 
+  // Return a pointer to the first occurrence of 'c' in s[] or nullptr
+  // if 'c' does not occur in s[]
+  const char* firstMatchChar( const char* s, char c );
+  // Find the last occurrent of 'c' in s[]. 
+  const char* lastMatchChar( const char* s, char c ); 
   
   bool isInteger( const char* );        // text contains only [0-9]
   bool isReal( const char* );           // text contains only [0-9] with one decimal place