Kotlin删除所有非字母数字字符

本文介绍了Kotlin删除所有非字母数字字符的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！ 问题描述

我正在尝试从字符串中删除所有非字母数字字符.

I am trying to remove all non alphanumeric characters from a string.

我尝试将replace()与正则表达式一起使用，如下所示:

I tried using replace() with a regex as followed:

var answer = answerEditText.text.toString() Log.d("debug", answer) answer = answer.replace("[^A-Za-z0-9 ]", "").toLowerCase() Log.d("debug", answer)

D/调试:测试. ，替换

D/debug: Test. ,replace

D/调试:测试. ，替换

D/debug: test. ,replace

为什么标点符号仍然存在?如何仅获取字母数字字符?

Why are the punctuation characters still present? How to get only the alphanumeric characters?

推荐答案

您需要创建一个正则表达式对象

You need to create a regex object

var answer = "Test. ,replace" println(answer) answer = answer.replace("[^A-Za-z0-9 ]", "") // doesn't work println(answer) val re = Regex("[^A-Za-z0-9 ]") answer = re.replace(answer, "") // works println(answer)

在线试用: try.kotlinlang/#/UserProjects/ttqm0r6lisi743f2dltveid1u9/2olerk6jvb10l03q6bkk1lapjn