pastes: validate URLs using regex

Signed-off-by: ATechnoHazard <amolele@gmail.com>

src/core/paste/service.rs

@@ -1,11 +1,13 @@
 use anyhow::Result;
 use diesel::pg::PgConnection;
+use regex::Regex;
 
 use super::entity::Paste;
 use super::postgres;
 
 pub fn create_paste(paste: &mut Paste, conn: &PgConnection) -> Result<usize> {
-    paste.is_url = Some(validator::validate_url(paste.content.clone()));
+    let re = Regex::new("^(https?://)?((([a-z\\d]([a-z\\d-]*[a-z\\d])*)\\.)+[a-z]{2,}|((\\d{1,3}\\.){3}\\d{1,3}))(:\\d+)?(/[-a-z\\d%_.~+]*)*(\\?[;&a-z\\d%_.~+=-]*)?(#[-a-z\\d_]*)?$").unwrap();
+    paste.is_url = Some(re.is_match(&*paste.content.clone()));
     postgres::create_paste(paste, conn)
 }