Java RegEx找不到匹配错误 [英] Java RegEx no match found error

问题描述

以下正则表达式给了我 java.lang.IllegalStateException:找不到匹配项错误

Following regex giving me java.lang.IllegalStateException: No match found error

String requestpattern = "^[A-Za-z]+ \\/+(\\w+)";
Pattern p = Pattern.compile(requestpattern);
Matcher matcher = p.matcher(requeststring);
return matcher.group(1);

其中请求字符串为

POST //upload/sendData.htm HTTP/1.1

任何帮助将不胜感激.

推荐答案

未尝试匹配.在调用 group()之前，先调用 find().

No match has been attempted. Call find() before calling group().

public static void main(String[] args) {
    String requeststring = "POST //upload/sendData.htm HTTP/1.1";
    String requestpattern = "^[A-Za-z]+ \\/+(\\w+)";
    Pattern p = Pattern.compile(requestpattern);
    Matcher matcher = p.matcher(requeststring);
    System.out.println(matcher.find());
    System.out.println(matcher.group(1));
}

输出:

true
upload

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