golang中的正则表达式

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package main   import (     "fmt"     "regexp" )   func main() {     // 1. 根据字符串匹配     m1, _ := regexp.MatchString("foo.*", "seafood")     fmt.Println(m1) // true     m2, _ := regexp.MatchString("^foo.*", "seafood")     fmt.Println(m2) // false       // 2. 根据字符串查找     reg1 := regexp.MustCompile(`\d{11}`)     ret1 := reg1.FindString("15313067271886595446515153130672712")     // 只查找第一个     ret2 := reg1.FindAllString("15313067271886545986715313067271", -1) // n:-1表示查找所有, 1找一个，2找2个     fmt.Println(ret1)                                                  // 15313067271     fmt.Println(ret2)                                                  // [15313067271 88654598671]       // 3. 获取分组信息     reg2 := regexp.MustCompile(`(\d{6})(\d{4})(\d{2})(\d{2})(\d{3})([0-9]|X)`)     ret3 := reg2.FindStringSubmatch("dsf130429191912015219k13042919591219521Xkk")     ret4 := reg2.FindAllStringSubmatch("dsf130429191912015219k13042919591219521Xkk", -1)       fmt.Println(ret3) // [130429191912015219 130429 1919 12 01 521 9]     fmt.Println(ret4) // [[130429191912015219 130429 1919 12 01 521 9] [13042919591219521X 130429 1959 12 19 521 X]]   }