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int preg_match (string pattern, string subject [, array
matches])
Searches subject for a match to the regular
expression given in pattern.
If matches is provided, then it is filled
with the results of search. $matches[0] will contain the text that
match the full pattern, $matches[1] will have the text that matched
the first captured parenthesized subpattern, and so on.
Returns true if a match for pattern was
found in the subject string, or false if not match was found
or an error occurred.
Example 1. find the string of text "php"
// the "i" after the pattern delimiter indicates a case-insensitive search
if (preg_match ("/php/i", "PHP is the web scripting language of choice.")) {
print "A match was found.";
} else {
print "A match was not found.";
}
Example 2. find the word "web"
// the \b in the pattern indicates a word boundary, so only the distinct
// word "web" is matched, and not a word partial like "webbing" or "cobweb"
if (preg_match ("/\bweb\b/i", "PHP is the web scripting language of choice.")) {
print "A match was found.";
} else {
print "A match was not found.";
}
if (preg_match ("/\bweb\b/i", "PHP is the website scripting language of choice.")) {
print "A match was found.";
} else {
print "A match was not found.";
}
Example 3. Getting the domain name out of a URL
preg_match("/^(.*)([^\.]+\.[^\.]+)(\/.*)?/U",
"http://www.php.net/index.html", $matches);
// show the second parenthesized subpattern
echo "domain name is: ".$matches[2]."\n";
