Regex Perl-正则表达式匹配的输出行为确实非常奇怪

我使用Perl和正则表达式来解析（格式不好的）输入文本文件中的条目。我的代码将输入文件的内容存储到$genes中，我定义了一个带有捕获组的正则表达式，将感兴趣的位存储在三个变量中：$number、$name和$sequence（请参见下面的Script.pl snippet）

在我尝试打印$sequence的值之前，这一切都非常有效。我试图在值周围添加引号，我的输出如下所示：

Number: '132'
Name: 'rps12 AmtrCp046'
'equence: 'ATGAATCTCAATGACCAAGAATTGGCAATTGACACTGAAAGGAACTATAGAATACCTGGAATCTCACAAA

Number: '134'
Name: 'psbA AmtrCp001'
'equence: 'ATGATCCCTACCTTATTGACCGCAACTTCTGTATTTATTATCGCCTTCATTGCGGCTCCTCCAGTAGATA

请注意序列中缺少的S，它已被替换为一个单引号，并且请注意序列本身并没有像我预期的那样在其周围加引号。我不明白为什么$sequence的print语句的行为如此奇怪。我怀疑我的正则表达式有问题，但我一点也不知道那可能是什么。任何帮助都将不胜感激

Script.pl代码段

while ($genes =~ />([0-9]+)\s+([A-Za-z]+)\|([A-Za-z]+)\|([A-Za-z0-9]*\s+[A-Za-z0-9]+)\s+([ACGT]+\s)/g) {
   # Get the value of the first capture group in the matched string (the first bit of stuff in parenthesis)
   # ([0-9+)
   $number = $1;

   # Get the value of the fourth capture group
   # ([A-Za-z0-9]*\s+[A-Za-z0-9]+)
   $name = $4;

   # Get the value of the fifth capture group
   # ([ACGT]+\s)
   $sequence = $5;

   print "Number: \." . $number . "\.\n";
   print "Name: \'" . $name . "\'\n";
   print "sequence: \'" . $sequence . "\'\n";
   print "\n";
}

输入文件片段

while ($genes =~ />([0-9]+)\s+([A-Za-z]+)\|([A-Za-z]+)\|([A-Za-z0-9]*\s+[A-Za-z0-9]+)\s+([ACGT]+\s)/g) {
   # Get the value of the first capture group in the matched string (the first bit of stuff in parenthesis)
   # ([0-9+)
   $number = $1;

   # Get the value of the fourth capture group
   # ([A-Za-z0-9]*\s+[A-Za-z0-9]+)
   $name = $4;

   # Get the value of the fifth capture group
   # ([ACGT]+\s)
   $sequence = $5;

   print "Number: \." . $number . "\.\n";
   print "Name: \'" . $name . "\'\n";
   print "sequence: \'" . $sequence . "\'\n";
   print "\n";
}

132 gnl | Ambtr | rps12 AmtrCp046 ATGAATCTCAATGACCAAGAATGGCAATTGAAGGAACTATAGAATAGGAATCCAAA AATCTGATTTTAGAATTCATTCATTCATTCAATAACATTCGTGGAATACGATTCATTCATTT CAAGATGCCTTGGTGAATGGTAGACACGGACTCAAATCGTGCTAAAGAGAGCTGGAGTC GAGTCTCTCTCAAGCATGAAGATGATGCTCATGATGAGCAATCAATACAGAGAGATCTCGATCT AATCGATTGGCAAGTTCATAGAAGTATTCGGCGATCCCCACAGATCCGAGGTCAGCTGTTGTTTG ATTTAGTTAGTTAACCA

---

似乎输入文件使用CR+LF来结束行。将其存储到$sequence（因为

\s

位于捕获括号内）。打印时，它将光标移动到行的开头，然后打印最终的引号，覆盖“序列”中的“S”

解决方案：不要捕获变量中的最终空格

$genes =~ />([0-9]+)\s+([A-Za-z]+)\|([A-Za-z]+)\|([A-Za-z0-9]*\s+[A-Za-z0-9]+)\s+([ACGT]+)\s/g
#                                                                                        ^^^  

说明：

Options: dot matches newline; case insensitive; ^ and $ match at line breaks

Assert position at the beginning of a line (at beginning of the string or after a line break character) «^»
Match any single character «.*?»
   Between zero and unlimited times, as few times as possible, expanding as needed (lazy) «*?»
Match the regular expression below and capture its match into backreference number 1 «([0-9]+)»
   Match a single character in the range between “0” and “9” «[0-9]+»
      Between one and unlimited times, as many times as possible, giving back as needed (greedy) «+»
Match any single character «.*»
   Between zero and unlimited times, as many times as possible, giving back as needed (greedy) «*»
Match the character “|” literally «\|»
Match the regular expression below and capture its match into backreference number 2 «([\w ]+)»
   Match a single character present in the list below «[\w ]+»
      Between one and unlimited times, as many times as possible, giving back as needed (greedy) «+»
      A word character (letters, digits, and underscores) «\w»
      The character “ ” « »
Match the regular expression below and capture its match into backreference number 3 «(.+)»
   Match any single character «.+»
      Between one and unlimited times, as many times as possible, giving back as needed (greedy) «+»
Assert position at the end of a line (at the end of the string or before a line break character) «$»

---

啊！非常感谢。我觉得我忽略了一些简单/愚蠢的事情。

Options: dot matches newline; case insensitive; ^ and $ match at line breaks

Assert position at the beginning of a line (at beginning of the string or after a line break character) «^»
Match any single character «.*?»
   Between zero and unlimited times, as few times as possible, expanding as needed (lazy) «*?»
Match the regular expression below and capture its match into backreference number 1 «([0-9]+)»
   Match a single character in the range between “0” and “9” «[0-9]+»
      Between one and unlimited times, as many times as possible, giving back as needed (greedy) «+»
Match any single character «.*»
   Between zero and unlimited times, as many times as possible, giving back as needed (greedy) «*»
Match the character “|” literally «\|»
Match the regular expression below and capture its match into backreference number 2 «([\w ]+)»
   Match a single character present in the list below «[\w ]+»
      Between one and unlimited times, as many times as possible, giving back as needed (greedy) «+»
      A word character (letters, digits, and underscores) «\w»
      The character “ ” « »
Match the regular expression below and capture its match into backreference number 3 «(.+)»
   Match any single character «.+»
      Between one and unlimited times, as many times as possible, giving back as needed (greedy) «+»
Assert position at the end of a line (at the end of the string or before a line break character) «$»