CODEWITHSUNDEEP
regexpreg-replace
imulsion
imulsion

Reputation: 9040

Beginning regex

I have absolutely no idea about regex at all. I am trying to perform email validation in a PHP signup script (to check if a valid email has been entered). I have got a script from the internet but I don't know how it works and I am completely unfamiliar with the functions used. I found out that the function they used (eregi_replace()) is deprecated in favor of preg_replace(). Firstly, can someone guide me through the steps of the function below, and secondly can you explain the preg_replace() function and how it works? The validation script:

$regex = "([a-z0-9_.-]+)". # name
            "@". # at
            "([a-z0-9.-]+){2,255}". # domain & possibly subdomains
            ".". # period
            "([a-z]+){2,10}"; # domain extension 
        $eregi = eregi_replace($regex, '', $email);
        $valid_email = empty($eregi) ? true : false;

The script was sourced from here

Upvotes: 0

Views: 47

Answers (1)

Casimir et Hippolyte
Casimir et Hippolyte

Reputation: 89639

regex are not needed here:

filter_var('[email protected]', FILTER_VALIDATE_EMAIL);

if you want training i suggest you to visit http://www.regular-expressions.info and http://php.net

To quickly test a pattern you can use this online tool: http://regex.larsolavtorvik.com/

Upvotes: 4

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