diff --git a/src/Common.css b/src/Common.css
index 9c11a6d..b1ca4eb 100644
--- a/src/Common.css
+++ b/src/Common.css
@@ -21,3 +21,7 @@
     border-bottom: 1px solid black;
     font-weight: bold;
 }
+
+.url-pid-link {
+    opacity: .6;
+}
\ No newline at end of file
diff --git a/src/Common.js b/src/Common.js
index f2f43de..4f5a098 100644
--- a/src/Common.js
+++ b/src/Common.js
@@ -28,6 +28,7 @@ export class HighlightedText extends PureComponent {
                     let [rule,p]=part;
                     return (
                         <span key={idx}>{
+                            rule==='url_pid' ? <span className="url-pid-link" title={p}>/hole/##</span> :
                             rule==='url' ? <a href={normalize_url(p)} target="_blank" rel="noopener">{p}</a> :
                             rule==='pid' ? <a href={'##'+p} onClick={(e)=>{e.preventDefault(); this.props.show_pid(p);}}>{p}</a> :
                             rule==='nickname' ? <span style={{backgroundColor: this.props.color_picker.get(p)}}>{p}</span> :
diff --git a/src/Flows.js b/src/Flows.js
index 9024564..bdec505 100644
--- a/src/Flows.js
+++ b/src/Flows.js
@@ -1,7 +1,7 @@
 import React, {Component, PureComponent} from 'react';
 import copy from 'copy-to-clipboard';
 import {ColorPicker} from './color_picker';
-import {split_text,NICKNAME_RE,PID_RE,URL_RE} from './text_splitter';
+import {split_text, NICKNAME_RE, PID_RE, URL_RE, URL_PID_RE} from './text_splitter';
 import {format_time, build_highlight_re, Time, TitleLine, HighlightedText, ClickHandler} from './Common';
 import './Flows.css';
 import LazyLoad from './react-lazyload/src';
@@ -70,6 +70,7 @@ class Reply extends PureComponent {
 
     render() {
         let parts=split_text(this.props.info.text,[
+            ['url_pid',URL_PID_RE],
             ['url',URL_RE],
             ['pid',PID_RE],
             ['nickname',NICKNAME_RE],
@@ -117,6 +118,7 @@ class FlowItem extends PureComponent {
     render() {
         let props=this.props;
         let parts=props.parts||split_text(props.info.text,[
+            ['url_pid',URL_PID_RE],
             ['url',URL_RE],
             ['pid',PID_RE],
             ['nickname',NICKNAME_RE],
@@ -468,6 +470,7 @@ class FlowItemRow extends PureComponent {
         let show_pid=load_single_meta(this.props.show_sidebar,this.props.token,[this.state.info.pid]);
 
         let hl_rules=[
+            ['url_pid',URL_PID_RE],
             ['url',URL_RE],
             ['pid',PID_RE],
             ['nickname',NICKNAME_RE],
diff --git a/src/text_splitter.js b/src/text_splitter.js
index aeb800d..0e4ec18 100644
--- a/src/text_splitter.js
+++ b/src/text_splitter.js
@@ -1,4 +1,6 @@
+// regexp should match the WHOLE segmented part
 export const PID_RE=/(^|[^\d])([1-9]\d{4,5})(?!\d|\u20e3|\ufe0e|\ufe0f)/g;
+export const URL_PID_RE=/((?:https?:\/\/)?pkuhelper\.pku\.edu\.cn\/hole\/?#(?:#|%23)([1-9]\d{4,5}))(?!\d|\u20e3|\ufe0e|\ufe0f)/g;
 export const NICKNAME_RE=/(^|[^A-Za-z])((?:(?:Angry|Baby|Crazy|Diligent|Excited|Fat|Greedy|Hungry|Interesting|Japanese|Kind|Little|Magic|Naïve|Old|Powerful|Quiet|Rich|Superman|THU|Undefined|Valuable|Wifeless|Xiangbuchulai|Young|Zombie)\s)?(?:Alice|Bob|Carol|Dave|Eve|Francis|Grace|Hans|Isabella|Jason|Kate|Louis|Margaret|Nathan|Olivia|Paul|Queen|Richard|Susan|Thomas|Uma|Vivian|Winnie|Xander|Yasmine|Zach)|You Win(?: \d+)?|洞主)(?![A-Za-z])/gi;
 export const URL_RE=/(^|[^.@a-zA-Z0-9_])((?:https?:\/\/)?(?:(?:[\w-]+\.)+[a-zA-Z]{2,3}|\d{1,3}\.\d{1,3}\.\d{1,3}\.\d{1,3})(?::\d{1,5})?(?:\/[\w~!@#$%^&*()\-_=+[\];,./?]*)?)(?![a-zA-Z0-9])/gi;
 
@@ -14,9 +16,14 @@ export function split_text(txt,rules) {
             if(rule) // already tagged by previous rules
                 return [part];
             else {
-                return content.split(regex).map((seg)=>(
-                    regex.test(seg) ? [name,seg] : [null,seg]
-                ));
+                return content
+                    .split(regex)
+                    .map((seg)=>(
+                        regex.test(seg) ? [name,seg] : [null,seg]
+                    ))
+                    .filter(([name,seg])=>(
+                        name!==null || seg
+                    ));
             }
         }));
     });