[Resolved] need a good regexp tutorial

dbmasters

It seems every time I post here it is regarding reg exp. I have found some tutorials, but none seem very user friendly.

Now I am just trying to find "string1" and put a link around it as long as it is not preceeded by "string2". SHouldn't be that hard to figure out with a simple tutorial, but, well, maybe I am not that bright, or brain just can't wrap around RegExp, but it's killing me.

Anyone care to explain the simple suntax above and maybe give a link to a good tutorial?

thanks

devinemke

http://www.regularexpressions.info

buraks78

eregi_replace('(?<!string2)string1','string1withurl',$text);

should work...

dbmasters

Well, that one didn't work, thanks for taking a shot at it tho. I am reading thru the tutorial right now. I looked at this tutorial, but could not make much out of it. I'll keep trying. Thanks.

I want to match the word "granite" that does not have the word "river" in front of it to link to a page listing granite types, so I tried:

[^River ]/(G|g)ranite/i

to use in a preg_replace, but it does not work. However, the simple

/(G|g)ranite/i

Will replace all the findings of the word.

buraks78

how about a simple approach

eregi_replace('^string1','string1withurl',$text);

dbmasters

Oh, I edited my message above with more details,sorry.

buraks78

ok now i have an idea what you are trying to do...

eregi_replace('(?<!string2)\sstring1','string1withurl',$text);

eregi_replace('(?<!string2\s)string1','string1withurl',$text);

dbmasters

no dice, I am trying this per your guidance:

Function regWords($input)
{
$reg=array(
		"(?<!River)\s(G|g)ranite"=>"<a href=\"/rock.php?r=3\">\\2ranite</a>",
//		"[^River ]/(G|g)ranite/i"=>"<a href=\"/rock.php?r=3\">\\1ranite</a>",
//		"/(G|g)ranite/i"=>"<a href=\"/rock.php?r=3\">\\1ranite</a>",
		"/(M|m)arble/i"=>"<a href=\"/rock.php?r=4\">\\1arble</a>",
		"/Zodiaq/i"=>"<a href=\"/rock.php?r=5\">Zodiaq</a>&#174;",
		"/DuPont/i"=>"<a href=\"http://www.dupont.com/\" target=\"_blank\">DuPont</a>&trade;"
);
return preg_replace(array_keys($reg),array_values($reg),$input);
}

and the function reutrns nothing from this. The very first is yours, two are acommented out and the final two do work.

buraks78

convert this line

(?<!River)\s(G|g)ranite

to case insensitive as others... as in

(?<!River)\sgranite/i

as for the function not returning anything, thats odd..

buraks78

also, you might need to use the g flag to make repetitive conversions. am i right?

dbmasters

Imight be wrong, but I am using the (G|g) to be able to return the same case to the print out of the link...

and it replaces multiples as is.

buraks78

i just tested the following

echo preg_replace('/(?<!river)\s(G|g)ranite/i','AAAA',$text);

and it replaced the appropriate ones with the aaaa... no problem...

check out your syntas inside the funcitons.. put a slash infront of the pattern and make sure backreferences are not the cause....

dbmasters

PERFECT!

Muchos gracious

The best partis, I think I actually understand it...