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Message: [QUOTE="Robert Klemme, post: 4513111"] Caret doesn't mean "from start" here. You probably overlooked the brackets. [^'&] is a character class and here "^" means "not", i.e. all characters that are not ' and not &. Basically this regexp extracts the value of HTTP parameter "user" from a URL or part of a URL. The backslash before the single quote is meaningless IMHO. Yes, $1 receives the value of the group. There are two groups, $1 receives the value of group 1 and $2 .... (left as excercise :-)). Yupp. In fact in the shell spaces *separate* arguments. :-) Kind regards robert [/QUOTE]