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I read that But have few issues.
I am not able to understand:
RewriteRule ^/~([^/]+)/?(.*) /u/$1/$2 [R]
What does ^/ sign means?
what does [^/]+ the plus sign means?
what does (.*) means?
Anyone who have clear understanding what these sign means?
They are regular expressions. The mod_rewrite makes heavy use of them. Like the * means 0 or more of the precedding or can mean any characters the ^ normaly means the begining while the $ will mean the end. + is one or more of the precedding and the ? zero or one of the preceding.
Not sure I totaly understand the first one but I think it means look for anything that has letters A-Z or a-z (has to be at least one or more) followed by /guides/. The last line looks the same but they both seem to be missing dome things.
the format is normally
RewriteRule pattern replacement [flags]