replace boost in Fit/Tool/StringUtil.cpp

Fit/Tool/StringUtil.cpp

@@ -13,13 +13,22 @@
 //  ************************************************************************************************
 
 #include "Fit/Tool/StringUtil.h"
-#include <boost/algorithm/string.hpp>
+#include <algorithm>
+#include <ranges>
+#include <regex>
 
 //! Returns token vector obtained by splitting string at delimiters.
 std::vector<std::string> mumufit::stringUtil::split(const std::string& text,
                                                     const std::string& delimiter)
 {
-    std::vector<std::string> tokens;
-    boost::split(tokens, text, boost::is_any_of(delimiter));
-    return tokens;
+    std::vector<std::string> result;
+    size_t pos = 0;
+    while (pos != std::string::npos) {
+        size_t next_pos = text.find(delimiter, pos);
+        result.push_back(text.substr(pos, next_pos - pos));
+        if (next_pos == std::string::npos)
+            break;
+        pos = next_pos + delimiter.length();
+    }
+    return result;
 }