我使用preg_match来格式化曲目列表，这样曲目编号、标题和持续时间就可以在表中分隔成各自的单元格：
<td>01</td><td>Track Title</td><td>01:23</td>
问题是轨道本身可以采取以下任何形式（轨道编号和持续时间上的前导零并不总是存在）：
01. Track Title (01:23)
01. Track Title 01:23
01. Track Title
1 Track Title (01:23)
1 Track Title 01:23
1 Track Title
以下仅适用于带有时间戳的轨道：
/([0-9]+)'.?['s+](.*)['s+]('?[0-5]?[0-9]:[0-5][0-9]')?)/
所以我在时间戳中添加了?：
/([0-9]+)'.?['s+](.*)['s+](('?[0-5]?[0-9]:[0-5][0-9]')?)?/
这适用于没有时间戳的曲目，但有时间戳的歌曲最终会被标题卡住，就像这样：
<td>01</td><td>Track Title 01:23</td><td></td>
EDIT：跟踪列表是纯文本的，在解析之前从SQL表中提取。
试试这个：
/^([0-9]+)'.?['s]+(.*)(['s]+('(?[0-5]?[0-9]:[0-5][0-9]')?))?$/U
注意，我使用了不规则模式修饰符U来尝试匹配最小的匹配字符串，并且我已经锚定了字符串的开头和结尾。
默认情况下，正则表达式是贪婪的，因此匹配标题.*
的部分会吃掉字符串的其余部分，因为最后一个带有持续时间的部分是可选的。
使用/U修饰符打开不自由行为-查找打开的PCRE_UNGREEDYhttp://us1.php.net/manual/en/reference.pcre.pattern.modifiers.php
怎么样：
^([0-9]+)'.?'s+(.*?)(?:'(?([0-5]?[0-9]:[0-5][0-9])')?)?$
解释：
正则表达式：
(?-imsx:^([0-9]+)'.?'s+(.*?)(?:'(?([0-5]?[0-9]:[0-5][0-9])')?)?$)
matches as follows:
NODE EXPLANATION
----------------------------------------------------------------------
(?-imsx: group, but do not capture (case-sensitive)
(with ^ and $ matching normally) (with . not
matching 'n) (matching whitespace and #
normally):
----------------------------------------------------------------------
^ the beginning of the string
----------------------------------------------------------------------
( group and capture to '1:
----------------------------------------------------------------------
[0-9]+ any character of: '0' to '9' (1 or more
times (matching the most amount
possible))
----------------------------------------------------------------------
) end of '1
----------------------------------------------------------------------
'.? '.' (optional (matching the most amount
possible))
----------------------------------------------------------------------
's+ whitespace ('n, 'r, 't, 'f, and " ") (1 or
more times (matching the most amount
possible))
----------------------------------------------------------------------
( group and capture to '2:
----------------------------------------------------------------------
.*? any character except 'n (0 or more times
(matching the least amount possible))
----------------------------------------------------------------------
) end of '2
----------------------------------------------------------------------
(?: group, but do not capture (optional
(matching the most amount possible)):
----------------------------------------------------------------------
'(? '(' (optional (matching the most amount
possible))
----------------------------------------------------------------------
( group and capture to '3:
----------------------------------------------------------------------
[0-5]? any character of: '0' to '5' (optional
(matching the most amount possible))
----------------------------------------------------------------------
[0-9] any character of: '0' to '9'
----------------------------------------------------------------------
: ':'
----------------------------------------------------------------------
[0-5] any character of: '0' to '5'
----------------------------------------------------------------------
[0-9] any character of: '0' to '9'
----------------------------------------------------------------------
) end of '3
----------------------------------------------------------------------
')? ')' (optional (matching the most amount
possible))
----------------------------------------------------------------------
)? end of grouping
----------------------------------------------------------------------
$ before an optional 'n, and the end of the
string
----------------------------------------------------------------------
) end of grouping
----------------------------------------------------------------------