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| package main | |
| import ( | |
| "fmt" | |
| "io" | |
| "net/http" | |
| "regexp" | |
| "strings" | |
| ) | |
| func main() { | |
| // url := "https://www.exchange-rates.org/ko/exchange-rate-history/usd-krw-2024-07-19" | |
| url := "https://www.google.com/search?q=USD+KRW+RATE" | |
| resp, err := http.Get(url) | |
| if err != nil { | |
| fmt.Println("failed to send request:", err) | |
| return | |
| } | |
| defer resp.Body.Close() | |
| body, err := io.ReadAll(resp.Body) | |
| if err != nil { | |
| fmt.Println("failed to read response:", err) | |
| return | |
| } | |
| html := string(body) | |
| // targetStr := "대한민국 원" | |
| targetStr := " 대한민국 원" | |
| startIndex := strings.Index(html, targetStr) | |
| if startIndex == -1 { | |
| fmt.Println(html) | |
| fmt.Println("could not find the string.") | |
| return | |
| } | |
| contextLength := 50 | |
| startIndex = startIndex - contextLength | |
| if startIndex < 0 { | |
| startIndex = 0 | |
| } | |
| endIndex := startIndex + contextLength + len(targetStr) | |
| if endIndex > len(html) { | |
| endIndex = len(html) | |
| } | |
| rawContext := html[startIndex:endIndex] | |
| re := regexp.MustCompile(`[0-9]+(\,[0-9]{3})*\.[0-9]+`) | |
| match := re.FindString(rawContext) | |
| if match == "" { | |
| fmt.Println("could not find any number.") | |
| return | |
| } | |
| exchangeRate := strings.ReplaceAll(match, ",", "") | |
| fmt.Println("Exchange rate 1 USD to KRW:", exchangeRate) | |
| } |
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