我如何匹配android中的模式

Question

我目前正在开发一个Android项目。我想知道一个字符串是否包含'\ r'或'\ n'作为最后一个字符。如何进行模式匹配？

Answer 1

试试这个。

String string = "stackoverflow";
lastchar = string.substring(string.length() - 1);

它会给你结果＆＃34; w＆＃34;。

Answer 2

试

    String  patterntomatch ="^[_A-Za-z0-9-]*(\r\n)$";
    Pattern pattern=Pattern.compile(patterntomatch);
    Matcher matcher=pattern.matcher(matchfromedittext);

    boolean matcher.matches();

Answer 3

String last = your_string.substring(Math.max(your_string.length() - 2, 0));
//It will give you the last 2 characters of the string. If the string is null 
//or has less than 2 characters, then it gives you the original string.

if(last.equals("\r") || last.equals("\n")){
    //String's last two characters are either \n or \r. Now do something.
}