Java与正则表达式、子串

Question

当谈到正则表达式时我完全迷失了。我得到生成的字符串，例如:

Your number is (123,456,789)

如何过滤掉 123,456,789？

Answer 1

您可以使用此正则表达式来提取包括逗号的数字

\(([\d,]*)\)

第一个捕获的组将有你的比赛。代码如下所示

String subjectString = "Your number is (123,456,789)";
Pattern regex = Pattern.compile("\\(([\\d,]*)\\)");
Matcher regexMatcher = regex.matcher(subjectString);
if (regexMatcher.find()) {
    String resultString = regexMatcher.group(1);
    System.out.println(resultString);
}

正则表达式的解释

"\\(" +          // Match the character “(” literally
"(" +           // Match the regular expression below and capture its match into backreference number 1
   "[\\d,]" +       // Match a single character present in the list below
                      // A single digit 0..9
                      // The character “,”
      "*" +           // Between zero and unlimited times, as many times as possible, giving back as needed (greedy)
")" +
"\\)"            // Match the character “)” literally

这将帮助您开始 http://www.regular-expressions.info/reference.html