PHP and MySQL Web Development 4th Ed-tqw-_darksiderg

130 Chapter 4 String Manipulation and Regular Expressions
$toaddress = “retail@example.com”;
} else if (eregi(“deliver|fulfill”, $feedback)) {
$toaddress = “fulfillment@example.com”;
} else if (eregi(“bill|account”, $feedback)) {
$toaddress = “accounts@example.com”;
}
if (eregi(“bigcustomer\.com”, $email)) {
$toaddress = “bob@example.com”;
}
Replacing Substrings with Regular Expressions
You can also use regular expressions to find and replace substrings in the same way as
you used str_replace().The two functions available for this task are ereg_replace()
and eregi_replace().The function ereg_replace() has the following prototype:
string ereg_replace(string pattern, string replacement, string search);
This function searches for the regular expression pattern in the search string and
replaces it with the string replacement.
The function eregi_replace() is identical but, again, is not case sensitive.
Splitting Strings with Regular Expressions
Another useful regular expression function is split(), which has the following prototype:
array split(string pattern, string search[, int max]);
This function splits the string search into substrings on the regular expression pattern
and returns the substrings in an array.The max integer limits the number of items that
can go into the array.
This function can be useful for splitting up email addresses, domain names, or dates.
For example,
$address = “username@example.com”;
$arr = split (“\.|@”, $address);
while (list($key, $value) = each ($arr)) {
echo “”.$value;
}
This example splits the hostname into its five components and prints each on a separate
line.
username
@
example
.
com