我在 Go 中有一个简单的程序来帮助学习正则表达式。它在无限循环中运行，有 2 个通道，一个用于提供输入（输入包含正则表达式模式和主题），第二个用于提供输出。
usage: main.exe (cat)+ catcatdog
但是，代码中可能有问题，因为我似乎无法使用$修饰符获得任何结果。
例如，我期望“猫”输出
main.exe cat$ cat\ndog
但收到零结果。
代码：
package main
import (
"fmt"
"regexp"
"bufio"
"os"
"strings"
)
type RegexRequest struct {
regex string
subject string
}
func main() {
regexRequests := make(chan *RegexRequest)
defer close(regexRequests)
regexAnswers, err := createResolver(regexRequests)
defer close(regexAnswers)
if(err != nil) { // TODO: Panics when exited via ctrl+c
panic(err)
}
interact(regexRequests, regexAnswers)
}
func interact(regexRequests chan *RegexRequest, regexAnswers chan []string) {
for {
fmt.Println("Enter regex and subject: ")
reader := bufio.NewReader(os.Stdin)
line, err := reader.ReadString('\n')
if(err != nil) {
panic(err)
}
regAndString := strings.SplitN(line, " ", 2);
if len(regAndString) != 2 {
fmt.Println("Invalid input, expected [regex][space][subject]")
continue
}
regexRequests <- &RegexRequest{ regAndString[0], regAndString[1] }
result := <- regexAnswers
var filteredResult []string
for _, element := range result {
if(element != "") {
filteredResult = append(filteredResult, element)
} else {
filteredResult = append(filteredResult, "EMPTY");
}
}
fmt.Println(strings.Join(filteredResult, " "))
}
}
func createResolver(inputChan chan *RegexRequest)(outputChan chan []string, err error) {
if(cap(inputChan) > 0) {
return nil, fmt.Errorf("Expected an unbuffered channel")
}
outputChan = make(chan []string)
err = nil
go func() {
for {
var regReq *RegexRequest= (<- inputChan);
var regex *regexp.Regexp = regexp.MustCompile(regReq.regex)
outputChan <- regex.FindAllString(regReq.subject, -1)
}
}()
return
}