Add replace_all string utility

Utility to search and replace strings inside a string.

Author: Joel Allred

src/util/string_utils.cpp

@@ -148,3 +148,20 @@ std::string escape(const std::string &s)
 
   return result;
 }
+
+/// Copyright notice:
+/// Attributed to Gauthier Boaglio
+/// Source: https://stackoverflow.com/a/24315631/7501486
+/// Used under MIT license
+void replace_all(
+  std::string &str,
+  const std::string &from,
+  const std::string &to)
+{
+  size_t start_pos = 0;
+  while((start_pos = str.find(from, start_pos)) != std::string::npos)
+  {
+    str.replace(start_pos, from.length(), to);
+    start_pos += to.length();
+  }
+}

src/util/string_utils.h

@@ -67,4 +67,6 @@ Stream &join_strings(
 /// programming language.
 std::string escape(const std::string &);
 
+void replace_all(std::string &, const std::string &, const std::string &);
+
 #endif