首次提交：初始化项目代码

regexp/regexp_demo_9.go

@@ -0,0 +1,20 @@
+package main
+
+import (
+	"fmt"
+	"regexp"
+)
+
+func main() {
+	text := "A:99元，B:199元，积分:50"
+	// 捕获【数字+元】整体，分组单独取出数字
+	re := regexp.MustCompile(`(\d+)元`)
+	matches := re.FindAllStringSubmatch(text, -1)
+
+	var amountList []string
+	for _, item := range matches {
+		// item[0] = 99元，item[1] = 99 纯数字
+		amountList = append(amountList, item[1])
+	}
+	fmt.Println("仅提取金额数字：", amountList)
+}