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Online Sandbox for SQL and PHP: Write, Run, Test, and Share SQL Queries and PHP Code
<?php
$login_phone = '+7 (999) 999-99-99';
if (preg_match('/^\+7 \(\d{3}\) \d{3}-\d{2}-\d{2}$/', $login_phone)) {
echo 'ok';
} else {
echo 'wrong number';
}