Go 中的正則表達(dá)式提供了一種強(qiáng)大的字符串處理工具：使用 regexp 包進(jìn)行正則表達(dá)式操作。利用正則表達(dá)式語法來匹配和操作字符串?？善ヅ渥址?、重復(fù)字符、分組、錨點(diǎn)和邊界符。通過 MatchString 匹配字符串、FindStringSubmatch 提取匹配和 ReplaceAllString 替換字符串。應(yīng)用場景包括驗(yàn)證電子郵件地址、提取 HTML 鏈接等。
Golang 正則表達(dá)式的使用指南
簡介
正則表達(dá)式（regex）是一種強(qiáng)大的工具，用于匹配和操作字符串。Go 提供了內(nèi)置的 regexp 包，可以幫助你輕松使用正則表達(dá)式。
正則表達(dá)式語法
正則表達(dá)式通常使用以下語法：
-
字符類： 用于匹配單個(gè)字符，例如
[abc]匹配 'a'、'b' 或 'c'。 -
重復(fù)字符： 限定符用于指定字符重復(fù)的次數(shù)，例如
+表示一次或多次。 -
分組： 圓括號用于分組字符，例如
(abc)匹配字符串 "abc"。 -
錨點(diǎn)： 用于匹配字符串的開頭或結(jié)尾，例如
^和$。 -
邊界符： 用于匹配字符串的單詞或行邊界，例如
\b。
Go 中的正則表達(dá)式
要使用 regexp 包，請導(dǎo)入它：
import "regexp"
以下是一些在 Go 中使用正則表達(dá)式的示例代碼：
匹配字符串
re := regexp.MustCompile("abc")
fmt.Println(re.MatchString("abcdef")) // 輸出：true提取匹配
re := regexp.MustCompile("(\\d+)-([a-z]+)")
fmt.Println(re.FindStringSubmatch("123-abc")) // 輸出：["123-abc", "123", "abc"]替換字符串
re := regexp.MustCompile("abc")
fmt.Println(re.ReplaceAllString("abcdef", "xyz")) // 輸出："xyzdef"實(shí)戰(zhàn)案例
驗(yàn)證電子郵件地址
re := regexp.MustCompile("^[a-zA-Z0-9.!#$%&'*+/=?^_`{|}~-]+@[a-zA-Z0-9](?:[a-zA-Z0-9-]{0,61}[a-zA-Z0-9])?(?:\.[a-zA-Z0-9](?:[a-zA-Z0-9-]{0,61}[a-zA-Z0-9])?)*$")
fmt.Println(re.MatchString("username@example.com")) // 輸出：true從 HTML 中提取鏈接
re := regexp.MustCompile(`<a href="([^"]+)">`)
for _, link := range re.FindAllStringSubmatch(`<a href="/page1">Page 1</a> <a href="/page2">Page 2</a>`, -1) {
fmt.Println(link[1]) // 輸出："page1" 和 "page2"
}The above is the detailed content of Golang regular expression usage guide. For more information, please follow other related articles on the PHP Chinese website!
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