Regulární výraz php
Příklady kódu
regex php
<?php
// First Verif your regex code with https://regex101.com/
$str = "Visit W3Schools";
$pattern = "/w3schools/i";
echo preg_match($pattern, $str); // Outputs 1
// test email with REGEX
if (!preg_match("/[-0-9a-zA-Z.+_]+@[-0-9a-zA-Z.+_]+.[a-zA-Z]{2,4}/", $emailAddress)){
//Email address is invalid.
}
// use filter var to valide Email
if(filter_var($emailAddress, FILTER_VALIDATE_EMAIL))
{
//The email address is valid.
} else{
//The email address is invalid.
}
?>
Co je regulární výraz v php
A regular expression is a sequence of characters that forms a search pattern. regulární výraz php
Modifier Description
i Makes the match case insensitive
m Specifies that if the string has newline or carriage
return characters, the ^ and $ operators will now
match against a newline boundary, instead of a
string boundary
o Evaluates the expression only once
s Allows use of . to match a newline character
x Allows you to use white space in the expression for clarity
g Globally finds all matches
cg Allows a search to continue even after a global match fails
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