Find a regular expression

"http://www.baidu.com/link?url=N9rqre5k19AvSHy4SZZFS5S7OsMhEOW5XExHhTzaTW"

"

I"m going to match the domain name now because sometimes it"s https or http. I"m going to match http://www.baidu.com/ or https://www.baidu.com/
. How do I write this regular expression

?

^https?://\S+$

upstairs, this seems to be superfluous.

^http(s)?
^http[s ]?
^https?
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-64f5-1b305ca-2bcff.MAI); waiting for someone to free some space... (errno: 28 "No space left on device")
MySQL Errno : 1021
Message : Disk full (/tmp/#sql-temptable-64f5-1b305ca-2bcff.MAI); waiting for someone to free some space... (errno: 28 "No space left on device")
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