RegEx problem..

Anon

i want to write a code that validates according to these rules:

String must only be a valid string if it contains :
1. Characters Aa to Zz,
2. Digits: 0 - 9
3. #$^*+=:%

hoping for your reply.. 🙂

thanks. jun

Anon

if (preg_match("/[A-Z0-9#\$^*+=:%]/i", $string)) {
// valid
} else {
// not valid
}

Hope that helps

Chris King

Anon

off the top of my head...

if (preg_match("/^{[A-Za-z0-9#$^{*+=:%]+$/",$string))}}
echo "string is valid";

stone

if (ereg("^{[A-Za-z0-9#$^{*+=:%]+$",$teststring))}} {
echo "$teststring is valid.";
} else {
echo "$teststring is invalid.";
}

should work.

It doesn't accept:
- accented letters like 'äöü'
- empty strings
- dots ('.')

The expression asks, if $teststring contains only one ore more [+] of the characters between '[' and ']' from the beginning (⁾ to the end ($). If you want to accept empty strings, replace the '+' at the end of the expression with a '*'.

HIH
-Christoph

Anon

Only problem in this and the above one are:

ereg("^{[A-Za-z0-9#$^*+=:%]+$"}
At these points --

Are all functions in regular expressions so you need to escape them like so:

ereg("^{[A-Za-z0-9#\$^*+=:%]+$"}

Hope that helps!

Chris King

Anon

I don't think that is necessary. Inside a character class $*+ do NOT have any meaning, and ^ only means some thing if it begins the character class.

Anon

Thanks guys, for all the replies. I'm am just new in web programming.. not very much experienced esp with regular expression.. Its very new to me and its kinda' hard to understand.. But i find it very handy for string validation. CAN YOU GUYS TELL ME SOME SITES WHERE I CAN LEARN REGEX via a tutorial or something.. design for newbies.?

jun

pnoeric

Jun - I just found a great book about regular expressions, published by O'Reilly, I think it's at www.oreilly.com/regex or just search Amazon for "regular expressions" and you'll see the O'Reilly book come right up (along with my review).

best,
Eric

Anon

it would be nicer if that could be browsed online. I don't have enough money to buy a book online. Its very expensive and since I live in Philippines, it will cost a lot more.... i'm still a student.. 🙂

pnoeric

Jun - I agree-- I wish I could have found something good online before I went and got this book. Maybe someone knows of a good web tutorial, you'd think it'd be out there, but everything I read (including the one at devshed) just wasn't very clear. :-(

best,
Eric