VERY IMPORTANT question about validation using php

[sudhakararaog]

i am using php in order to validate a form where users register. please help me to solve the following validations.

 

1. name can have spaces. ex= john smith

presently the validation i am using is if( $fname == ""  || !eregi("^[a-zA-Z_]+$", $fname) )

i need the syntax which would accept a-zA-Z WITH A SPACE IN BETWEEN NAMES ex= john smith

 

2. text can have spaces and special characters ex= ref 100/abcd

presently the validation i am using is if( $depositnumber == ""  || !eregi("^[a-zA-Z0-9_]+$", $depositnumber) )

i need the syntax which would accept a-zA-Z0-9 WITH A SPACE IN BETWEEN AND SPECIAL CHARACTERS ex= ref 100/abcd

 

3. spaces in numbers. ex= 123 4567

presently the validation i am using is if( $phonenumber == ""  || !eregi("^[0-9]+$", $phonenumber) )

i need the syntax which would accept 0-9 WITH A SPACE IN BETWEEN ex= 123 4567

 

4. in case of [a-zA-Z0-9_] if i remove the "_" after 9 will it have a negative impact or is this a syntax due to which i

 

should i leave the "_" as part of [a-zA-Z0-9_]

 

5. using stripslashes() function

due to the above validation there is no way a user can enter special characters which could lead to sql injection. inspite of

 

this should i still use stripslashes to be on the safe side.

 

please provide the exact syntax for the above validations to works as specified for different scenarios.

 

thanks.

 

[uniflare]

ok i would reccomend preg_match,

 

also ask REGEX questions here for maximum help;

http://www.phpfreaks.com/forums/index.php/board,43.0.html