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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
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Kotlin删除所有非字母数字字符
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