範例:在字串 1000abcd123 中找出前後兩個數字。
範例1:符合到這個字串的範例
package main import( "fmt" "regexp" ) var digitsRegexp = regexp.MustCompile(`(\d+)\D+(\d+)`) func main(){ someString:="1000abcd123" fmt.Println(digitsRegexp.FindStringSubmatch(someString)) }
上面程式碼輸出:
[1000abcd123 1000 123]
範例2:使用命名的正規表示式
package main import( "fmt" "regexp" ) var myExp=regexp.MustCompile(`(?P<first>\d+)\.(\d+).(?P<second>\d+)`) func main(){ fmt.Printf("%+v",myExp.FindStringSubmatch("1234.5678.9")) }
上面程式碼輸出,所有符合的都輸出了:
[1234.5678.9 1234 5678 9]
這裡的Named capturing groups (?P
範例3:對正規表示式類別擴展一個獲得所有命名資訊的方法,並使用它。
package main import( "fmt" "regexp" ) //embed regexp.Regexp in a new type so we can extend it type myRegexp struct{ *regexp.Regexp } //add a new method to our new regular expression type func(r *myRegexp)FindStringSubmatchMap(s string) map[string]string{ captures:=make(map[string]string) match:=r.FindStringSubmatch(s) if match==nil{ return captures } for i,name:=range r.SubexpNames(){ //Ignore the whole regexp match and unnamed groups if i==0||name==""{ continue } captures[name]=match[i] } return captures } //an example regular expression var myExp=myRegexp{regexp.MustCompile(`(?P<first>\d+)\.(\d+).(?P<second>\d+)`)} func main(){ mmap:=myExp.FindStringSubmatchMap("1234.5678.9") ww:=mmap["first"] fmt.Println(mmap) fmt.Println(ww) }
上面程式碼的輸出結果:
map[first:1234 second:9] 1234
範例4,抓取限號訊息,並記錄到一個Map。
package main import( "fmt" iconv "github.com/djimenez/iconv-go" "io/ioutil" "net/http" "os" "regexp" ) // embed regexp.Regexp in a new type so we can extend it type myRegexp struct{ *regexp.Regexp } // add a new method to our new regular expression type func(r *myRegexp)FindStringSubmatchMap(s string)[](map[string]string){ captures:=make([](map[string]string),0) matches:=r.FindAllStringSubmatch(s,-1) if matches==nil{ return captures } names:=r.SubexpNames() for _,match:=range matches{ cmap:=make(map[string]string) for pos,val:=range match{ name:=names[pos] if name==""{ continue } /* fmt.Println("+++++++++") fmt.Println(name) fmt.Println(val) */ cmap[name]=val } captures=append(captures,cmap) } return captures } // 抓取限号信息的正则表达式 var myExp=myRegexp{regexp.MustCompile(`自(?P<byear>[\d]{4})年(?P<bmonth>[\d]{1,2})月(?P<bday>[\d]{1,2})日至(?P<eyear>[\d]{4})年(?P<emonth>[\d]{1,2})月(?P<eday>[\d]{1,2})日,星期一至星期五限行机动车车牌尾号分别为:(?P<n11>[\d])和(?P<n12>[\d])、(?P<n21>[\d])和(?P<n22>[\d])、(?P<n31>[\d])和(?P<n32>[\d])、(?P<n41>[\d])和(?P<n42>[\d])、(?P<n51>[\d])和(?P<n52>[\d])`)} func ErrorAndExit(err error){ fmt.Fprintln(os.Stderr,err) os.Exit(1) } func main(){ response,err:=http.Get("http://www.bjjtgl.gov.cn/zhuanti/10weihao/index.html") defer response.Body.Close() if err!=nil{ ErrorAndExit(err) } input,err:=ioutil.ReadAll(response.Body) if err!=nil{ ErrorAndExit(err) } body :=make([]byte,len(input)) iconv.Convert(input,body,"gb2312","utf-8") mmap:=myExp.FindStringSubmatchMap(string(body)) fmt.Println(mmap) }
上述程式碼輸出:
[map[n32:0 n22:9 emonth:7 n11:3 n41:1 n21:4 n52:7 bmonth:4 n51:2 bday:9 n42:6 byear:2012 eday:7 eyear:2012 n12:8 n31:5] map[emonth:10 n41:5 n52:6 n31:4 byear:2012 n51:1 eyear:2012 n32:9 bmonth:7 n22:8 bday:8 n11:2 eday:6 n42:0 n21:3 n12:7] map[bday:7 n51:5 n22:7 n31:3 eday:5 n32:8 byear:2012 bmonth:10 emonth:1 eyear:2013 n11:1 n12:6 n52:0 n21:2 n42:9 n41:4] map[eyear:2013 byear:2013 n22:6 eday:10 bmonth:1 n41:3 n32:7 n31:2 n21:1 n11:5 bday:6 n12:0 n51:4 n42:8 emonth:4 n52:9]]
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