first commit

mangashelf-server/node_modules/@honeo/check/_is/is-ipv4.mjs

@@ -0,0 +1,19 @@
+
+// Var
+const re_0to255 = /(\d|[1-9]\d|1\d{2}|2(5[0-5]|[0-4]\d))/;
+const re_ipv4 = new RegExp(`^(${re_0to255.source}\\.){3}${re_0to255.source}$`);
+
+/*
+	IPv4アドレス文字列か
+		dotで区切られた0-255が4つ。
+
+		args
+			1: string
+		result
+			boolean
+*/
+function isIPv4(str){
+	return re_ipv4.test(str);
+}
+
+export default isIPv4;