正则表达式匹配捕获组中的文本 [英] Regex Match text within a Capture Group

问题描述

示例文本:

\- !ruby/object:DynamicAttribute 
  attributes: 
    resource_id: "1"
    resource_type: Applicant
    string_value: "Michael"
    int_value: 
    id: "35972390"
    date_value: 
    name: first_name
  attributes_cache: {}

\- !ruby/object:DynamicAttribute 
  attributes: 
    resource_id: "1"
    resource_type: Applicant
    string_value: "Johnson"
    int_value: 
    id: "35533149"
    date_value: 
    name: last_name
  attributes_cache: {}

目标:

我试图在string_value"之后提取值，其中name"等于某个字符串.假设它等于 last_name.属性没有任何特定的顺序.我已经使用捕获组进行了探索，但并没有走多远.

I'm trying to extract the value after "string_value" where the "name" equals some string. Let's say it equals last_name. The attributes are not in any particular order. I've explored using capture groups but I did not get very far.

对此的任何帮助将不胜感激.谢谢！

Any help on this would be appreciated. Thanks!

推荐答案

你可以试试这个正则表达式:

You can try this regex:

string_value:(?=(?:(?!attributes_cache).)*name: last_name)\s+\"(\w+)\".*?attributes_cache

说明

1. string_value: 匹配字符 string_value:
2. Positive Lookahead (?=(?:(?!attributes_cache).)*name: last_name) 它会提前查看是否包含 name: last_name 但会不要超出 attributes_cache ，否则它可能与下一个可能具有 name: last_name
的结果集重叠
3. \s+ 匹配任何空白字符(等于 [\r\n\t\f\v ])
4. 量词 - 在一次和无限次之间匹配，尽可能多次，根据需要回馈(贪婪)
5. \" 字面上匹配字符 "(区分大小写)
6. 第一个捕获组 (\w+) : \w+匹配任何单词字符(等于 [a-zA-Z0-9_])=> 这是您要捕获的文本.

1. string_value: matches the characters string_value:
2. Positive Lookahead (?=(?:(?!attributes_cache).)*name: last_name) it looks ahead to see if it contains name: last_name but will not go beyond attributes_cache , otherwise it may overlap with the next result set which may have name: last_name
3. \s+ matches any whitespace character (equal to [\r\n\t\f\v ])
4. Quantifier — Matches between one and unlimited times, as many times as possible, giving back as needed (greedy)
5. \" matches the character " literally (case sensitive)
6. 1st Capturing Group (\w+) : \w+ matches any word character (equal to [a-zA-Z0-9_]) => this is the text that you want capture.

捕获组 1 包含您要查找的文本.

The capture group 1 contains the text that you are looking for.

虽然你没有描述编程语言但是下面的例子是在ruby上完成的(运行它):

Although you haven't described the programming language but the following sample is done on ruby (run it) :

re = /string_value:(?=(?:(?!attributes_cache).)*name: last_name)\s+\"(\w+)\".*?attributes_cache/m
str = '\\- !ruby/object:DynamicAttribute 
  attributes: 
    resource_id: "1"
    resource_type: Applicant
    string_value: "Johnson1"
    int_value: 
    id: "35533149"
    date_value: 
    name: last_name
  attributes_cache: {}

\\- !ruby/object:DynamicAttribute 
  attributes: 
    resource_id: "1"
    resource_type: Applicant
    string_value: "Michael"
    int_value: 
    id: "35972390"
    date_value: 
    name: first_name
  attributes_cache: {}

\\- !ruby/object:DynamicAttribute 
  attributes: 
    resource_id: "1"
    resource_type: Applicant
    string_value: "Johnson2"
    int_value: 
    id: "35533149"
    date_value: 
    name: last_name
  attributes_cache: {}'

# Print the match result
str.scan(re) do |match|
    puts match.to_s
end

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