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<?php
/**
* Regular expression helper
*/
class Red_Regex {
private $pattern;
private $case;
public function __construct( $pattern, $case_insensitive = false ) {
$this->pattern = rawurldecode( $pattern );
$this->case = $case_insensitive;
}
/**
* Does $target match the regex pattern, applying case insensitivity if set.
*
* Note: if the pattern is invalid it will not match
*
* @param string $target Text to match the regex against.
* @return boolean match
*/
public function is_match( $target ) {
return @preg_match( $this->get_regex(), $target, $matches ) > 0;
}
private function encode_path( $path ) {
return str_replace( ' ', '%20', $path );
}
private function encode_query( $path ) {
return str_replace( ' ', '+', $path );
}
/**
* Regex replace the current pattern with $replace_pattern, applied to $target
*
* Note: if the pattern is invalid it will return $target
*
* @param string $replace_pattern The regex replace pattern.
* @param string $target Text to match the regex against.
* @return string Replaced text
*/
public function replace( $replace_pattern, $target ) {
$regex = $this->get_regex();
$result = @preg_replace( $regex, $replace_pattern, $target );
if ( is_null( $result ) ) {
return $target;
}
// Space encode the target
$split = explode( '?', $result );
if ( count( $split ) === 2 ) {
$result = implode( '?', [ $this->encode_path( $split[0] ), $this->encode_query( $split[1] ) ] );
} else {
$result = $this->encode_path( $result );
}
return $result;
}
private function get_regex() {
$at_escaped = str_replace( '@', '\\@', $this->pattern );
$case = '';
if ( $this->is_ignore_case() ) {
$case = 'i';
}
return '@' . $at_escaped . '@s' . $case;
}
public function is_ignore_case() {
return $this->case;
}
}