我的正则表达式导致Java中的堆栈溢出; 我错过了什么？

Question

我试图使用Scanner的正则表达式来匹配文件中的字符串.正则表达式适用于该行以外的所有内容:

DNA="ITTTAITATIATYAAAYIYI[....]ITYTYITTIYAIAIYIT"

在实际文件中,省略号代表数千个字符.

当读取文件的循环到达包含基数的行时,会发生堆栈溢出错误.

这是循环:

while (scanFile.hasNextLine()) {
   final String currentLine = scanFile.findInLine(".*");
   System.out.println("trying to match '" + currentLine + "'");
   Scanner internalScanner = new Scanner(currentLine);
   String matchResult = internalScanner.findInLine(Constants.ANIMAL_INFO_REGEX);
   assert matchResult != null : "there's no reason not to find a match"; 
   matches.put(internalScanner.match().group(1), internalScanner.match().group(2));
   scanFile.nextLine();
  }

和正则表达式:

static final String ANIMAL_INFO_REGEX = "([a-zA-Z]+) *= *\"(([a-zA-Z_.]| |\\.)+)";

这是失败追踪:

java.lang.StackOverflowError
    at java.util.regex.Pattern$CharProperty.match(Pattern.java:3360)
    at java.util.regex.Pattern$Branch.match(Pattern.java:4131)
    at java.util.regex.Pattern$GroupHead.match(Pattern.java:4185)
    at java.util.regex.Pattern$Loop.match(Pattern.java:4312)
    at java.util.regex.Pattern$GroupTail.match(Pattern.java:4244)
    at java.util.regex.Pattern$BranchConn.match(Pattern.java:4095)
    at java.util.regex.Pattern$CharProperty.match(Pattern.java:3362)
    at java.util.regex.Pattern$Branch.match(Pattern.java:4131)
    at java.util.regex.Pattern$GroupHead.match(Pattern.java:4185)
    at java.util.regex.Pattern$Loop.match(Pattern.java:4312)
    at java.util.regex.Pattern$GroupTail.match(Pattern.java:4244)
    at java.util.regex.Pattern$BranchConn.match(Pattern.java:4095)
    at java.util.regex.Pattern$CharProperty.match(Pattern.java:3362)
    at java.util.regex.Pattern$Branch.match(Pattern.java:4131)
    at java.util.regex.Pattern$GroupHead.match(Pattern.java:4185)
    at java.util.regex.Pattern$Loop.match(Pattern.java:4312)
    at java.util.regex.Pattern$GroupTail.match(Pattern.java:4244)
    at java.util.regex.Pattern$BranchConn.match(Pattern.java:4095)
    ...etc (it's all regex).

非常感谢!

Answer 1

尝试这个正则表达式的简化版本，它删除了一些不必要的|运算符（这可能导致正则表达式引擎进行大量分支）并包括行锚点的开头和结尾。

static final String ANIMAL_INFO_REGEX = "^([a-zA-Z]+) *= *\"([a-zA-Z_. ]+)\"$";