【问题标题】：Retrieve string given search criteria. Brackets, quotations and more检索给定搜索条件的字符串。括号，报价和更多
【发布时间】：2016-10-29 15:02:13
【问题描述】：

我有以下字符串：

NoticeText:
    NoticeType [str] = USER_TYPING_ON
    Text [str] = "user is typing"
    EventInfo:
        PartyId [int] = 2
        EventType [str] = MESSAGE
        UserNickname [str] = "Michael"
        EventId [int] = 4
        Text [str] = "Hey, how are you?"
        MsgCheck [str] = NONE
        TimeOffset [int] = 23
        UserType [str] = AGENT
NoticeText:
    NoticeType [str] = USER_TYPING_ON
    EventInfo:
    PartyId [int] = 1
        EventType [str] = MESSAGE
        UserNickname [str] = "Bob Smith"
        EventId [int] = 6
        Text [str] = "I'm good, how are you?"
        MsgCheck [str] = NONE
        TimeOffset [int] = 28
        UserType [str] = CLIENT
        MessageType [str] = "text"

我需要能够检索句子“我很好，你好吗？”。我完全被难住了。

我试图检索“Text [str] =”之后的短语，这会返回我需要的内容。但它也会返回“Text [str] =”之后的所有其他句子。

PartyId [int], 字段可能对你们有所帮助。 1 对应于客户端。这是我需要的人的信息。

我只是不知道如何缩小范围。

请帮忙！

【问题讨论】：

标签： java regex string substring phrase

【解决方案1】：

说明

^NoticeText:(?:(?!\nNoticeText:).)*\n\s+EventInfo(?:(?!\nNoticeText:).)*\n\s+Text\s*\[str\]\s*=\s*"([^"]*)"(?:(?!\nNoticeText:).)*\nNoticeText:(?:(?!\nNoticeText:).)*\n\s+EventInfo(?:(?!\nNoticeText:).)*\n\s+Text\s*\[str\]\s*=\s*"([^"]*)"(?:(?!\nNoticeText:).)*

_{** 要更好地查看图像，只需右键单击图像并选择在新窗口中查看}

示例

现场演示

https://regex101.com/r/tD6uV9/1

示例文本

NoticeText:
    NoticeType [str] = USER_TYPING_ON
    Text [str] = "user is typing"
    EventInfo:
        PartyId [int] = 2
        EventType [str] = MESSAGE
        UserNickname [str] = "Michael"
        EventId [int] = 4
        Text [str] = "Hey, how are you?"
        MsgCheck [str] = NONE
        TimeOffset [int] = 23
        UserType [str] = AGENT
NoticeText:
    NoticeType [str] = USER_TYPING_ON
    EventInfo:
    PartyId [int] = 1
        EventType [str] = MESSAGE
        UserNickname [str] = "Bob Smith"
        EventId [int] = 6
        Text [str] = "I'm good, how are you?"
        MsgCheck [str] = NONE
        TimeOffset [int] = 28
        UserType [str] = CLIENT
        MessageType [str] = "text"

示例匹配

捕获组 0 获取两个 NoticeText 块
捕获组 1 在第一个 NoticeText 中的 EventInfo 之后获取第一个 Text [str]
捕获组 2 在第二个 NoticeText 之后获得第二个 Text [str] PartyID

MATCH 1
Capture Group 1.    [246-263]   `Hey, how are you?`
Capture Group 2.    [566-588]   `I'm good, how are you?`

说明

NODE                     EXPLANATION
----------------------------------------------------------------------
  ^                        the beginning of the string
----------------------------------------------------------------------
  NoticeText:              'NoticeText:'
----------------------------------------------------------------------
  (?:                      group, but do not capture (0 or more times
                           (matching the most amount possible)):
----------------------------------------------------------------------
    (?!                      look ahead to see if there is not:
----------------------------------------------------------------------
      \n                       '\n' (newline)
----------------------------------------------------------------------
      NoticeText:              'NoticeText:'
----------------------------------------------------------------------
    )                        end of look-ahead
----------------------------------------------------------------------
    .                        any character except \n
----------------------------------------------------------------------
  )*                       end of grouping
----------------------------------------------------------------------
  \n                       '\n' (newline)
----------------------------------------------------------------------
  \s+                      whitespace (\n, \r, \t, \f, and " ") (1 or
                           more times (matching the most amount
                           possible))
----------------------------------------------------------------------
  EventInfo                'EventInfo'
----------------------------------------------------------------------
  (?:                      group, but do not capture (0 or more times
                           (matching the most amount possible)):
----------------------------------------------------------------------
    (?!                      look ahead to see if there is not:
----------------------------------------------------------------------
      \n                       '\n' (newline)
----------------------------------------------------------------------
      NoticeText:              'NoticeText:'
----------------------------------------------------------------------
    )                        end of look-ahead
----------------------------------------------------------------------
    .                        any character except \n
----------------------------------------------------------------------
  )*                       end of grouping
----------------------------------------------------------------------
  \n                       '\n' (newline)
----------------------------------------------------------------------
  \s+                      whitespace (\n, \r, \t, \f, and " ") (1 or
                           more times (matching the most amount
                           possible))
----------------------------------------------------------------------
  Text                     'Text'
----------------------------------------------------------------------
  \s*                      whitespace (\n, \r, \t, \f, and " ") (0 or
                           more times (matching the most amount
                           possible))
----------------------------------------------------------------------
  \[                       '['
----------------------------------------------------------------------
  str                      'str'
----------------------------------------------------------------------
  \]                       ']'
----------------------------------------------------------------------
  \s*                      whitespace (\n, \r, \t, \f, and " ") (0 or
                           more times (matching the most amount
                           possible))
----------------------------------------------------------------------
  =                        '='
----------------------------------------------------------------------
  \s*                      whitespace (\n, \r, \t, \f, and " ") (0 or
                           more times (matching the most amount
                           possible))
----------------------------------------------------------------------
  "                        '"'
----------------------------------------------------------------------
  (                        group and capture to \1:
----------------------------------------------------------------------
    [^"]*                    any character except: '"' (0 or more
                             times (matching the most amount
                             possible))
----------------------------------------------------------------------
  )                        end of \1
----------------------------------------------------------------------
  "                        '"'
----------------------------------------------------------------------
  (?:                      group, but do not capture (0 or more times
                           (matching the most amount possible)):
----------------------------------------------------------------------
    (?!                      look ahead to see if there is not:
----------------------------------------------------------------------
      \n                       '\n' (newline)
----------------------------------------------------------------------
      NoticeText:              'NoticeText:'
----------------------------------------------------------------------
    )                        end of look-ahead
----------------------------------------------------------------------
    .                        any character except \n
----------------------------------------------------------------------
  )*                       end of grouping
----------------------------------------------------------------------
  \n                       '\n' (newline)
----------------------------------------------------------------------
  NoticeText:              'NoticeText:'
----------------------------------------------------------------------
  (?:                      group, but do not capture (0 or more times
                           (matching the most amount possible)):
----------------------------------------------------------------------
    (?!                      look ahead to see if there is not:
----------------------------------------------------------------------
      \n                       '\n' (newline)
----------------------------------------------------------------------
      NoticeText:              'NoticeText:'
----------------------------------------------------------------------
    )                        end of look-ahead
----------------------------------------------------------------------
    .                        any character except \n
----------------------------------------------------------------------
  )*                       end of grouping
----------------------------------------------------------------------
  \n                       '\n' (newline)
----------------------------------------------------------------------
  \s+                      whitespace (\n, \r, \t, \f, and " ") (1 or
                           more times (matching the most amount
                           possible))
----------------------------------------------------------------------
  EventInfo                'EventInfo'
----------------------------------------------------------------------
  (?:                      group, but do not capture (0 or more times
                           (matching the most amount possible)):
----------------------------------------------------------------------
    (?!                      look ahead to see if there is not:
----------------------------------------------------------------------
      \n                       '\n' (newline)
----------------------------------------------------------------------
      NoticeText:              'NoticeText:'
----------------------------------------------------------------------
    )                        end of look-ahead
----------------------------------------------------------------------
    .                        any character except \n
----------------------------------------------------------------------
  )*                       end of grouping
----------------------------------------------------------------------
  \n                       '\n' (newline)
----------------------------------------------------------------------
  \s+                      whitespace (\n, \r, \t, \f, and " ") (1 or
                           more times (matching the most amount
                           possible))
----------------------------------------------------------------------
  Text                     'Text'
----------------------------------------------------------------------
  \s*                      whitespace (\n, \r, \t, \f, and " ") (0 or
                           more times (matching the most amount
                           possible))
----------------------------------------------------------------------
  \[                       '['
----------------------------------------------------------------------
  str                      'str'
----------------------------------------------------------------------
  \]                       ']'
----------------------------------------------------------------------
  \s*                      whitespace (\n, \r, \t, \f, and " ") (0 or
                           more times (matching the most amount
                           possible))
----------------------------------------------------------------------
  =                        '='
----------------------------------------------------------------------
  \s*                      whitespace (\n, \r, \t, \f, and " ") (0 or
                           more times (matching the most amount
                           possible))
----------------------------------------------------------------------
  "                        '"'
----------------------------------------------------------------------
  (                        group and capture to \2:
----------------------------------------------------------------------
    [^"]*                    any character except: '"' (0 or more
                             times (matching the most amount
                             possible))
----------------------------------------------------------------------
  )                        end of \2
----------------------------------------------------------------------
  "                        '"'
----------------------------------------------------------------------
  (?:                      group, but do not capture (0 or more times
                           (matching the most amount possible)):
----------------------------------------------------------------------
    (?!                      look ahead to see if there is not:
----------------------------------------------------------------------
      \n                       '\n' (newline)
----------------------------------------------------------------------
      NoticeText:              'NoticeText:'
----------------------------------------------------------------------
    )                        end of look-ahead
----------------------------------------------------------------------
    .                        any character except \n
----------------------------------------------------------------------
  )*                       end of grouping
----------------------------------------------------------------------

或者

如果您有一长串 NoticeText 块，那么您可以使用同一表达式的简化版本来解析它们。

^NoticeText:(?:(?!\nNoticeText:)[\s\S])*\n\s+Text\s*\[str\]\s*=\s*"([^"]*)"(?:(?!\nNoticeText:)[\s\S])*

在这个版本中，我使用的是全局标志和多行标志

示例

使用上面相同的示例文本，捕获组 0 获取单个 NoticeText，而捕获组 1 仅获取块中的最后一个 Text [str] 值

示例匹配

MATCH 1
Capture Group 1.    [246-263]   `Hey, how are you?`

MATCH 2
Capture Group 1.    [566-588]   `I'm good, how are you?`

现场演示

https://regex101.com/r/uW6cV6/1

【讨论】：