spring boot正则表达式匹配bcrypt

假设要匹配的密文：

A$2a$10$Cih2shiBNg5jWrj0i.2hbuzZ5.g9T6caaxNP4yYtp3.wpi48rXomu

 

代码如下：

            Pattern BCRYPT_PATTERN = Pattern
                    .compile("\\A\\$2a?\\$");

            // A$2a$10$Cih2shiBNg5jWrj0i.2hbuzZ5.g9T6caaxNP4yYtp3.wpi48rXomu
            if (!BCRYPT_PATTERN.matcher("A$2a$").matches()) {
                log.warn("Encoded password does not look like BCrypt");
            }else {
                log.info("匹配");
            }

            String str = "$2a$10$Cih2shiBNg5jWrj0i.2hbuzZ5.g9T6caaxNP4yYtp3.wpi48rXomu";
            String pattern = "\\A\\$2a?\\$\\d\\d\\$[./0-9A-Za-z]{53}";

            Pattern r = Pattern.compile(pattern);
            Matcher m = r.matcher(str);
            System.out.println("匹配 = {}" + m.matches());