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Home Backend Development Golang How to match characters between two occurrences of the same but random string

How to match characters between two occurrences of the same but random string

Feb 09, 2024 am 09:57 AM

How to match characters between two occurrences of the same but random string

php小编子墨在这里为大家介绍一种解决方案,即How to match characters between two occurrences of the same but random string。当遇到这种情况时,我们可以利用正则表达式和回溯引用来实现。首先,我们使用正则表达式捕获第一次出现的字符串,并将其存储为一个命名捕获组。然后,我们使用回溯引用来引用这个命名捕获组,并在表达式中匹配第二次出现的相同字符串。通过这种方式,我们可以轻松地匹配到这两次出现的相同字符串之间的字符。这是一个简单而有效的方法,希望能帮助到大家。

问题内容

基本字符串如下所示:

repeatedRandomStr ABCXYZ /an/arbitrary/@#-~/sequence/of_characters=I+WANT+TO+MATCH/repeatedRandomStr/the/rest/of/strings.etc
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我对这个基本字符串的了解是:

  • abcxyz 是恒定的并且始终存在。
  • repeatedrandomstr 是随机的,但它的第一次出现总是在开头和 abcxyz 之前

到目前为止,我研究了正则表达式上下文匹配、递归和子例程,但自己无法想出解决方案。

我当前工作的解决方案是首先确定 repeatedrandomstr 与什么:

^(.*)\sabcxyz

然后使用:

repeatedrandomstr\sabcxyz\s(.*)\srepeatedrandomstr

匹配我在 $1 中想要的内容。但这需要两个单独的正则表达式查询。我想知道这是否可以在一次执行中完成。

解决方法

在使用 re2 库的 go 中,除了你的方法之外没有其他方法:继续提取 abcxyz 之前的值,然后使用正则表达式来匹配两个字符串之间的字符串,如 re2 不支持也不会支持反向引用。

如果正则表达式风格可以切换到pcre或兼容,您可以使用

^(.*?)\s+ABCXYZ\s(.*)\1
^(.*?)\s+ABCXYZ\s(.*?)\1
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请参阅正则表达式演示

详细信息

  • ^ - 字符串开头
  • (.*?) - 第 1 组:除换行符之外的零个或多个字符尽可能少
  • \s+ - 一个或多个空格
  • abcxyz - 一些常量字符串
  • \s - 空格
  • (.*) - 第 2 组:除换行符之外的尽可能多的零个或多个字符
  • \1 - 与第 1 组中的值相同。

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