How to build a frequency table with a Symbol Table

createFreqTableFunc.go

func createFreqTable(arr []string) SymbolTable {
	st := &SymbolTable{
		data: &BSTree{},
	}
	r := regexp.MustCompile("[ .,123456789]")
  //iterate through words
	for _, word := range arr {
		if r.Match([]byte(word)) {
			//skip punctuation, spaces or numbers
			continue
		}
    //see if word can be found
		found := st.get(word)
		if found != nil {
      //if so, increment the count
			st.put(word, found.val+1)
		} else {
      //if not, add it to the symbol table
			st.put(word, 1)
		}
	}
	return *st
}