Java，检查String是否是回文。不区分大小写 [英] Java, Check if a String is a palindrome. Case insensitive

问题描述

我想写一个java方法来返回true，如果一个字符串是一个回文。

I want to write a java method to return true if a string is a palindrome.

这里是我到目前为止：

String palindrome = "...";
boolean isPalindrome = palindrome.equals(
   new StringBuilder(palindrome).reverse().toString());

我的问题是它不考虑一个词：汽车为回文。

My problem with this is that it does not consider a word like: Race car to be a palindrome.

Doc, note, I dissent. A fast never prevents a fatness. I diet on cod.

测试这是否是回文，不区分大小写和忽略标点符号的最佳方法。 / p>

What is the best way to test if this is a palindrome, with case insensitivity and ignoring punctuation.

推荐答案

使用此正则表达式删除所有标点符号和空格并将其转换为小写

Use this regex to remove all punctuation and spaces and convert it to lower case

String palindrome = "..." // from elsewhere
boolean isPalindrome = palindrome.replaceAll("[^A-Za-z]", "").toLowerCase().equals(new StringBuilder(palindrome.replaceAll("[^A-Za-z]", "").toLowerCase()).reverse().toString());

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