Re: Regular Expressions?

Thats what the book said too... but what I'm confused about is the word START and END -- at what point does the start end, and the end begin? If you look at my example below aaa.a! <-- matched > > aaa.! <-- no match > > after I put the $ on the end > > aaa.a! <-- no match > > aaa.aa32 <-- match... It looks like the ^ and $ are actually needed it you want the expression to work correctly *at all*. Thanks. Jason ""Jack Dempsey"" <dempsejn@georgetown.edu> wrote in message news:NEBBKBGAMLPMIDAJEALPEEOFCGAA.dempsejn@georgetown.edu... > if you put ^ at the start of your regexp, that means you want the start of > the string to match your expression...$ is used for the end of the string... > > -jack > > -----Original Message----- > From: Jason Caldwell [mailto:jason@thinkingman.org] > Sent: Friday, April 20, 2001 2:41 AM > To: php-general@lists.php.net > Subject: Re: [PHP] Regular Expressions? > > > I'm a little lost as to the exact function of the following: > > ^ and $ > > I noticed in the example below... that when I added the $ to the end of the > expression, I wasn't able anymore to put a non-alphanumeric character in the > end, for example (without the $) > > I was able to enter the following and get a 'match' > > aaa.a! <-- matched > > aaa.! <-- no match > > after I put the $ on the end > > aaa.a! <-- no match > > aaa.aa32 <-- match... > > So, am I to understand that the ^ and $ are used to tell the expression that > it *must* match what the expression expects? I guess why I'm so confused is > because -- I thought when you create an expression, that it must match the > parameters of that expression... then what are the ^ $ for?? It's like to > create an expression, but it truly won't work unless you have it turned on > with ^ $ characters. > > Thanks. > Jason > > > > "Brian Clark" <brianj@fusionwerks.com> wrote in message > news:92203389127.20010420015151@fusionwerks.com... > > Hi Jason, > > > > @ 1:43:19 AM on 4/20/2001, Jason Caldwell wrote: > > > > ... > > > I want to match any of the following: > > > > > 1.1 or a.a > > > > > or 1111.1111 or aaaa.aaaa <-- any number of digits (0-9) or alpha > (a-z) > > > on either side of the dot. > > > > > if(eregi("^([0-9][a-z]\.[0-9][a-z]", $myArray[x])) > > > > Your parentheses are slightly wrong. > > > > if( > > eregi( > > "^ > > ( > > /* unmatched parens */ > > > > [0-9][a-z] > > /* only matches one digit or character */ > > > > \. > > /* matches period */ > > > > [0-9][a-z] > > /* only matches one digit or character */ > > ", > > $myArray[x] > > ) > > /* syntax error :) */ > > ) > > > > > Is this correct? I think I'm missing something. > > > > You want something like this: > > > > <?php > > > > /* eregi("^([[:alnum:]]+\.[[:alnum:]]+)", $myArray[x]) */ > > > > $string = 'aaa.aaa'; > > $string_2 = 'aaaaaa'; > > > > print(eregi("^([[:alnum:]]+\.[[:alnum:]]+)", $string) ? 'matched' : > > 'no > match'); > > print(eregi("^([[:alnum:]]+\.[[:alnum:]]+)", $string_2) ? 'matched' : 'no > match'); > > > > ?> > > > > > Thanks. > > > Jason > > > > -Brian > > -- > > PGP is spoken here: 0xE4D0C7C8 > > Please, DO NOT carbon copy me on list replies. > > > > > > > > -- > > PHP General Mailing List (http://www.php.net/) > > To unsubscribe, e-mail: php-general-unsubscribe@lists.php.net > > For additional commands, e-mail: php-general-help@lists.php.net > > To contact the list administrators, e-mail: php-list-admin@lists.php.net > > > > > > -- > PHP General Mailing List (http://www.php.net/) > To unsubscribe, e-mail: php-general-unsubscribe@lists.php.net > For additional commands, e-mail: php-general-help@lists.php.net > To contact the list administrators, e-mail: php-list-admin@lists.php.net > > > > -- > PHP General Mailing List (http://www.php.net/) > To unsubscribe, e-mail: php-general-unsubscribe@lists.php.net > For additional commands, e-mail: php-general-help@lists.php.net > To contact the list administrators, e-mail: php-list-admin@lists.php.net >