How to implement REGEXP in foreach the right way? - php

Question

Hello,
How to add regexp the right way in this code in order to search for exact word in database?
$condition = '';
$name = "he is mad";
$query = explode(" ", $name);
foreach($query as $text) {
$condition .= "test LIKE '%".mysqli_real_escape_string($conn, $text)."%' OR ";
}
$condition = rtrim($condition, " OR ");
$sql_query = "SELECT * FROM test WHERE " . $condition;
$result = mysqli_query($conn, $sql_query);
if ($result->num_rows > 0) {
echo "1";
} else {
echo "0";
}
$conn->close();
I want to add this to the php code
SELECT
*
FROM
`table`
WHERE
Description regexp '(^|[[:space:]])pen([[:space:]]|$)';
It only works with me like this without foreach:
$sql_query = "SELECT * FROM test WHERE test regexp '(^|[[:space:]])$condition([[:space:]]|$)'";

Answer 1

You just need to remove the last " OR " from your $condition
<?php
$condition = '';
$name = "Hello world i am so sad";
$query = explode(" ", $name);
foreach($query as $text) {
$condition .= "test LIKE '%".mysqli_real_escape_string($conn, $text)."%' OR ";
}
// HERE REMOVE LAST " OR " FROM STRING
$condition = rtrim($condition, " OR ");
$sql_query = "SELECT * FROM test WHERE " . $condition;
$result = mysqli_query($conn, $sql_query);
if ($result->num_rows > 0) {
echo "1";
} else {
echo "0";
}
$conn->close();

Answer 2

If you have a phrase that is separated by spaces and you want to see if there is any overlap with the words, you can possibly use regular expressions:
where col regexp replace($name, ' ', '|')
Note that you should be passing $name in as a parameter.
If you care about word boundaries, you can introduce them into the regular expression. However, the exact form may depend on which regular expression library MySQL is using. The idea is:
where col regexp concat('\\b', replace($name, ' ', '\\b|\\b'), '\\b')