java - 如何找到“B”+最多 6 个标志

Question

我需要验证模式是否有字母“B”，并且在它之后最多六个符号（字母和数字）。例如：我们有abcdB1234B123456. 找到的答案应该是：B1234和B123456。

我做了这个模式：

[^B]{1,6}

但它不精确..

Answer 1

What about this pattern:

public static void main(String[] args) {
    final Pattern pattern = Pattern.compile("B[aAc-zC-Z0-9]{0,6}");
    final String string = " abcdB1234B123456";
    final Matcher matcher = pattern.matcher(string);
    while (matcher.find()) {
        System.out.println(matcher.group());
    }
}

Output:

B1234
B123456

Answer 2

Try this code :

String data = "abcdB1234B123456";
Pattern pattern = Pattern.compile("B[aAc-zC-Z\\d]{0,6}");

Matcher matcher = pattern.matcher(data);
while (matcher.find()) {
    // Indicates match is found. Do further processing
    System.out.println(matcher.group());
}