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sweatje
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PostPosted: Sat Nov 19, 2005 12:37 pm 
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Joined: Wed Jun 29, 2005 10:04 pm
Posts: 277
Location: Iowa, USA
d11wtq wrote:
That's a lookbehind done wrong :P

I guess you meant a lookahead ;)

\d(?!0)

o_O d11wtq is Mr Pedantic for the rest of the day :P


Mr Pedantic, looks like you need to brush up on your regex a bit ;) Here is a simpletest test case.

Syntax: [ Download ] [ Hide ]
function testRegexJokeExpression() {
    // how many regex does it take to change a lightbulb
    // correct answer, any non-zero digit
    $regex = '/\d(?<!0)/';
    $this->assertFalse(preg_match($regex,'0'));
    $this->assertTrue(preg_match($regex,'1'));
    $this->assertTrue(preg_match($regex,'10'));
 
    //another suggested regex
    $regex = '/\d(?!0)/';
    // this test fails with your regex
    $this->assertFalse(preg_match($regex,'0'), 'fails to fail for case 0');
    $this->assertTrue(preg_match($regex,'1'));
    $this->assertTrue(preg_match($regex,'10'));
 
    //modified this way, it actually would work
    $regex = '/(?!0)\d/';
    $this->assertFalse(preg_match($regex,'0'));
    $this->assertTrue(preg_match($regex,'1'));
    $this->assertTrue(preg_match($regex,'10'));
 
}
 


Last edited by sweatje on Sat Nov 19, 2005 3:36 pm, edited 1 time in total.

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Chris Corbyn
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PostPosted: Sat Nov 19, 2005 3:33 pm 
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Joined: Wed Mar 24, 2004 8:57 am
Posts: 13098
Location: Melbourne, Australia
Ah I see what you meant lol.... the tests made it clearer :)

I though you meant any number of regex less than ten (i.e. 1-9) ... I hadn't considered you were looking for a number not starting with a zero.

*shy's away* 8O
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feyd
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PostPosted: Thu Aug 31, 2006 9:27 pm 
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Joined: Mon Mar 29, 2004 4:24 pm
Posts: 31559
Location: Bothell, Washington, USA
This is a good a place as any to drop a resource. I don't know if anyone noticed, but O'Reilly released a new edition of Mastering Regular Expressions. This version includes a bunch of pages on PHP apparently.

Here's the link supplied by "the manual:" http://www.amazon.com/exec/obidos/ASIN/ ... /wwwphpnet
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Luke
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PostPosted: Thu Aug 31, 2006 10:35 pm 
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Joined: Fri Aug 05, 2005 1:53 pm
Posts: 6424
Location: Paradise, CA
that's funny... I just put that on my wish list today. About an hour ago.
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ducdm87
PostPosted: Thu Jun 20, 2013 4:58 am 
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Posts: 4
i see http://www.regular-expressions.info/tutorial.html is good tutorial
What sites do you know good online regex test. I see http://php.toolregex.com use good, easy to use interface
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