How to write regularization in the parameter part of the path of the route component in react-router

problem description

how does the route component in react-router write rules in path, for example:
my current path is like this
< Route path= "/ user/:id" / > parameter id I only match numbers, how should I write this path?
according to the document, I used this method to match unsuccessfully

clipboard.png

MySQL Query : SELECT * FROM `codeshelper`.`v9_news` WHERE status=99 AND catid='6' ORDER BY rand() LIMIT 5
MySQL Error : Disk full (/tmp/#sql-temptable-64f5-1b36589-2bffd.MAI); waiting for someone to free some space... (errno: 28 "No space left on device")
MySQL Errno : 1021
Message : Disk full (/tmp/#sql-temptable-64f5-1b36589-2bffd.MAI); waiting for someone to free some space... (errno: 28 "No space left on device")
Need Help?