About Preg Match patterns

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hi, i have a question, i dont know what keywords to search, so im asking here.

while using preg_match, there are lots of thing that can be written as $pattern.
for example:
preg_match("/php/i", "PHP is the web scripting language of choice.")

what is the meaning of  /i  ?
or '@^(?:http://)?([^/]+)@i'  there are lots of chars here,

or this: /(?P<name>\w+): (?P<digit>\d+)/
/[^\\d\\sa-zA-Z$_]/
/^[a-zA-Z\p{Cyrillic}0-9\s\-]+$/u    (there is a extra "/u" )

#^http:\/\/(.*)\.(gif|png|jpg)$#i
#<head>(.*?)<\/head>#si

there is lots and lots of different usage of these.

my question is, where can i find a very detailed information about these ? i want and need to know whats what about these.

Thanks,
tolga.

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