add new utility function utils::strfind()

src/utils.h

@@ -37,6 +37,14 @@ namespace LAMMPS_NS {
 
     bool strmatch(const std::string &text, const std::string &pattern);
 
+    /** Find substring that matches a simplified regex pattern
+     *
+     *  \param text the text to be matched against the pattern
+     *  \param pattern the search pattern, which may contain regexp markers
+     *  \return the string that matches the patters or an empty one */
+
+    std::string strfind(const std::string &text, const std::string &pattern);
+
     /** Send message to screen and logfile, if available
      *
      *  \param lmp   pointer to LAMMPS class instance