count_chars_appear.kt

/**
 * Copyright (c) 2023 Katorly (https://github.com/katorly)
 * 
 * This Source Code Form is subject to the terms of the Mozilla Public
 * License, v. 2.0. If a copy of the MPL was not distributed with this
 * file, You can obtain one at https://mozilla.org/MPL/2.0/.
 */
 
object textutils {
    /**
     * Count how many times a word containing one character
     * or two characters appears in your article.
     *
     * Only counts the word that appears more than one time.
     */
    fun count() {
        // Put the article you wanna scan
        val text = """
            你的文章文字
            放在这里
            啊啊啊啊啊
        """.trimIndent()
        // Skip these words you dont want
        val skip = listOf(""," ",",",".","!","?","\'","\"","(",")","\\","/",":",";","-","　","。","，","！","？","‘","’","“","”","：","；","《","》","1","2","3","4","5","6","7","8","9","0","a","b","c","d","e","f","g","h","i","j","k","l","m","n","o","p","q","r","s","t","u","v","w","x","y","z")
        val strings = text.split("\n")
        val wordlist: MutableMap<String, Int> = HashMap()
        var first = ""
        for (string in strings) {
            val c: CharArray = string.toCharArray()
            val s: MutableList<String> = ArrayList()
            for (char in c) s.add(char.toString())
            for (char in s) {
                var valid = true
                // Check if it's in skip list
                skip.forEach() {
                    if (char == it) valid = false
                }
                if (valid) {
                    // Check word containing one character
                    if (!wordlist.contains(char)) {
                        wordlist[char] = 1
                    } else {
                        wordlist[char] = wordlist[char]!! + 1
                    }
                    // Check word containing two characters
                    if (first != "") {
                        if (!wordlist.contains(first + char)) {
                            wordlist[first + char] = 1
                        } else {
                            wordlist[first + char] = wordlist[first + char]!! + 1
                        }
                    }
                    first = char
                } else continue
            }
        }
        // Print the results
        wordlist.forEach { (word, count) ->
            if (count > 1) {
                println("${word}: $count")
            }
        }
    }
}

Example Output:

文: 2
啊: 5
啊啊: 4