searching a string from html page in php - php

Question

<?php
$data = file_get_contents("http://localhost/traveller/index.html");
$regex = '$_POST[/"search"/]';
if (isset($_POST["sub"])){
if (preg_match($regex, $data)) {
echo $regex;
} else {
echo "not found";
}
}
?>
<form action="searching.php" method="POST">
Search: <br>
<input type="text" name="search">
<input type="submit" name="sub">
</form>
on running this program i get:
Warning preg_match(): No ending delimeter '$' found on line 6. not
found
what should i do now?

Answer 1

I guess you want:
$data = file_get_contents("http://localhost/traveller/index.html");
$regex = $_POST["search"];
if (isset($_POST["sub"])) {
if (preg_match('/' . preg_quote($regex) . '/i', $data)) {
echo $regex;
} else {
echo "not found";
}
}

Answer 2

I guess this is what you are looking for:
Your don't need the regular expression at all.
Here is the code for what you need.
Try this.
<?php
$data = file_get_contents("http://localhost/traveller/index.html");
if (isset($_POST["search"])&&!empty($_POST["search"])) {
$search_str = $_POST["search"];
if (strpos($data,$search_str)!== false) {
echo $search_str;
}
else {
echo "not found";
}
}
?>
<form action="searching.php" method="POST">
Search: <br>
<input type="text" name="search">
<input type="submit" name="sub">
</form>