查找与正则表达式golang匹配的所有字符串 [英] Find all string matches with Regex golang

问题描述

我试图返回一个数组或切片，其中包含针对字符串的特定正则表达式的所有匹配项.字符串是:

I am trying to return an array, or slice, with all the matches for a specific regex expression against a string. The string is:

{city}, {state} {zip}

我想返回一个包含花括号之间所有字符串匹配项的数组.我尝试使用 regexp 包来完成此操作，但无法弄清楚如何返回我要查找的内容.这是我当前的代码:

I want to return an array with all the matches of strings between curly braces. I have tried using the regexp package to accomplish this but cannot figure out how to return what I am looking for. This is my current code:

r := regexp.MustCompile("/({[^}]*})/")
matches := r.FindAllString("{city}, {state} {zip}", -1)

但是，无论我尝试什么，它每次返回的内容都是空的.

But, all it returns is an empty slice every time no matter what I try.

推荐答案

首先，您不需要正则表达式定界符.其次，使用原始字符串文字定义一个正则表达式模式是个好主意，您只需要使用1个反斜杠即可转义正则表达式元字符.第三，仅当需要获取不带{和}的值时，捕获组才是必需的，因此，可以将其删除以获取{city}，{state}和{zip}.

First, you do not need the regex delimiters. Second, it is a good idea to use raw string literals to define a regex pattern where you need to use only 1 backslash to escape regex metacharacters. Third, the capturing group is only necessary if you need to get the values without { and }, thus, you may remove it to get {city}, {state} and {zip}.

您可以使用 FindAllString 来获取所有匹配项:

You may use FindAllString to get all matches:

r := regexp.MustCompile(`{[^{}]*}`)
matches := r.FindAllString("{city}, {state} {zip}", -1)

请参见开始演示.

要仅获取花括号之间的部分，请使用 FindAllStringSubmatch 包含捕获括号的模式，{([^{}]*)}:

To only get the parts between curly braces use FindAllStringSubmatch with a pattern that contains capturing parentheses, {([^{}]*)}:

r := regexp.MustCompile(`{([^{}]*)}`)
matches := r.FindAllStringSubmatch("{city}, {state} {zip}", -1)
for _, v := range matches {
    fmt.Println(v[1])
}

请参见此Go演示.

正则表达式详细信息

• {-文字{ char
• ([^{}]*)-一个与{和}以外的任何0个或多个(由于*量词决定)字符匹配的捕获组([^...]是一个与所有除char之外的任何char匹配的否定字符类(c)在[^和]之间指定)
• }-文字} char

• { - a literal { char
• ([^{}]*)- a capturing group that matches any 0 or more (due to the * quantifier) characters other than { and } ([^...] is a negated character class matching any char but the one(s) specified between [^ and ])
• } - a literal } char

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