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what is this expression do?


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#1 bilis_money

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Posted 18 June 2006 - 02:19 AM

hi, i'm really very new to REGEX

but i think i have a basic question.
and the code was;

preg_match ("/userfile_[1-5]{1}/", $name)

what is this code do?
please explain it in detail?

thank you very much.




#2 poirot

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Posted 18 June 2006 - 04:41 AM

Splitting it:

"/" is the starting delimiter
"userfile_" matchs the string "userfile_" (literal)
"[1-5]" is a character class, numbers from 1 to 5
"{1}" is a quantifier (1 time)
"/" is the ending delimiter

It will match userfile_1, userfile_2, userfile_3, userfile_4, and userfile_5.

But since there are no anchors (^ and $) this means it will also match strings with anything before and after it.
~ D Kuang

#3 bilis_money

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Posted 18 June 2006 - 05:42 AM

hi poirot,
how long you had learned REGEX?
and what book do you have?
is it Jeffrey Freidl's book?

i guess i need more REGEX story and samples so that i can absorb them well
and to be familiarize as well.

thanks for your answers.

#4 Ninjakreborn

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Posted 19 June 2006 - 04:17 PM

Buy a copy of Programming PHP first version(don't know about the second), from a company called oreilly, by the time you read through there 2-3 pages on regex, you will understand fully all of the basics of regex, until you get down to themore involved stuff, you won't be able to make your own at that point, but atleast you will know what you are reading, and have quick references, you can look up anything under there regex, perl compatible, and post ex

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