feat: support gen short link and create pastebin using reply

src/main/kotlin/cn/rtast/fancybot/util/misc/URI.kt

@@ -10,10 +10,24 @@ package cn.rtast.fancybot.util.misc
 import java.net.URI
 import java.net.URL
 
+private val urlRegex = Regex(
+    "^(https?://)?" +
+            "([\\w\\-]+\\.)+[a-zA-Z]{2,6}" +
+            "|(https?://)?" +
+            "((25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?)\\.){3}" +
+            "(25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?)" +
+            "(:\\d{1,5})?" +
+            "(/.*)?$"
+)
+
 fun String.toURL(): URL {
     return URI(this).toURL()
 }
 
 fun String.toURI(): URI {
     return URI(this)
+}
+
+fun String.isValidUrl(): Boolean {
+    return urlRegex.matches(this)
 }