Go语言中实现正则表达式大小写不敏感匹配教程

package main

import (
    "fmt"
    "regexp"
    "strings"
)

func main() {
    // 假设 s.Name 是用户输入的字符串，例如 "North by Northwest"
    userName := "North by Northwest"

    // 替换空格为匹配空格、下划线或连字符的模式
    // 原始需求中是 strings.Replace(s.Name, " ", "[ \._-]", -1)
    // 这里的示例简化为匹配空格
    pattern := strings.ReplaceAll(userName, " ", "[ \._-]")

    // 添加 (?i) 标志实现大小写不敏感
    caseInsensitivePattern := "(?i)" + pattern

    // 编译正则表达式
    reg, err := regexp.Compile(caseInsensitivePattern)
    if err != nil {
        fmt.Println("正则表达式编译失败:", err)
        return
    }

    // 测试匹配
    testStrings := []string{
        "North by Northwest",
        "north by northwest",
        "NORTH BY NORTHWEST",
        "North_by_Northwest",
        "north-by-northwest",
        "North by_Northwest", // 包含下划线
    }

    fmt.Println("原始用户输入:", userName)
    fmt.Println("生成的正则表达式模式:", caseInsensitivePattern)

    for _, s := range testStrings {
        if reg.MatchString(s) {
            fmt.Printf("'%s' 匹配成功
", s)
        } else {
            fmt.Printf("'%s' 匹配失败
", s)
        }
    }
}

package main

import (
    "fmt"
    "regexp"
)

func main() {
    // 编译一个大小写不敏感的固定正则表达式
    // (?i) 使得 "CaSe" 能够匹配 "case", "CASE", "Case" 等
    r := regexp.MustCompile(`(?i)CaSe`)

    testStrings := []string{
        "This is a case test.",
        "This is a CASE test.",
        "This is a Case test.",
        "This is a cAse test.",
        "No match here.",
    }

    fmt.Println("固定正则表达式模式: `(?i)CaSe`")
    for _, s := range testStrings {
        if r.MatchString(s) {
            fmt.Printf("'%s' 匹配成功
", s)
        } else {
            fmt.Printf("'%s' 匹配失败
", s)
        }
    }
}