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Strings regex validation

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Update regex validation and add validation class to return full information. Add helper to return last error message from defined constant
This commit is contained in:
Clemens Schwaighofer
2025-06-05 14:29:04 +09:00
parent 3be3519e45
commit dbc72472f9
8 changed files with 380 additions and 13 deletions
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14
www/admin/class_test.strings.php
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@@ -128,11 +128,17 @@ print "Unique: " . Strings::removeDuplicates($input_string) . "<br>";
print "Unique: " . Strings::removeDuplicates(strtolower($input_string)) . "<br>";
$regex_string = "/^[A-z]$/";
print "Regex valid: " . $regex_string . ": "
. DgS::prBl(Strings::isValidRegexSimple($regex_string)) . "<br>";
print "Regex is: " . $regex_string . ": " . DgS::prBl(Strings::isValidRegex($regex_string)) . "<br>";
$regex_string = "'//test{//'";
print "Regex is: " . $regex_string . ": " . DgS::prBl(Strings::isValidRegex($regex_string)) . "<br>";
print "Regex is: " . $regex_string . ": " . DgS::printAr(Strings::validateRegex($regex_string)) . "<br>";
$regex_string = "/^[A-z";
print "Regex valid: " . $regex_string . ": "
. DgS::prBl(Strings::isValidRegexSimple($regex_string)) . "<br>";
print "Regex is: " . $regex_string . ": " . DgS::prBl(Strings::isValidRegex($regex_string)) . "<br>";
print "[A] LAST PREGE ERROR: " . preg_last_error() . " -> "
. (Strings::PREG_ERROR_MESSAGES[preg_last_error()] ?? '-') . "<br>";
$preg_error = Strings::isValidRegex($regex_string);
print "[B] LAST PREGE ERROR: " . preg_last_error() . " -> "
. Strings::getLastRegexErrorString() . " -> " . preg_last_error_msg() . "<br>";
print "</body></html>";

48
www/lib/CoreLibs/Convert/Strings.php
View File

@@ -12,6 +12,16 @@ use CoreLibs\Combined\ArrayHandler;
class Strings
{
/** @var array<int,string> all the preg error messages */
public const array PREG_ERROR_MESSAGES = [
PREG_NO_ERROR => 'No error',
PREG_INTERNAL_ERROR => 'Internal PCRE error',
PREG_BACKTRACK_LIMIT_ERROR => 'Backtrack limit exhausted',
PREG_RECURSION_LIMIT_ERROR => 'Recursion limit exhausted',
PREG_BAD_UTF8_ERROR => 'Malformed UTF-8 data',
PREG_BAD_UTF8_OFFSET_ERROR => 'Bad UTF-8 offset',
PREG_JIT_STACKLIMIT_ERROR => 'JIT stack limit exhausted'
];
/**
* return the number of elements in the split list
* 0 if nothing / invalid split
@@ -259,8 +269,9 @@ class Strings
* @param string $pattern Any regex string
* @return bool False on invalid regex
*/
public static function isValidRegexSimple(string $pattern): bool
public static function isValidRegex(string $pattern): bool
{
preg_last_error();
try {
$var = '';
@preg_match($pattern, $var);
@@ -269,6 +280,41 @@ class Strings
return false;
}
}
/**
* Returns the last preg error messages as string
* all messages are defined in PREG_ERROR_MESSAGES
*
* @return string
*/
public static function getLastRegexErrorString(): string
{
return self::PREG_ERROR_MESSAGES[preg_last_error()] ?? 'Unknown error';
}
/**
* check if a regex is invalid, returns array with flag and error string
*
* @param string $pattern
* @return array{valid:bool,preg_error:0,error:null|string,pcre_error:null|string}
*/
public static function validateRegex(string $pattern): array
{
// Clear any previous PCRE errors
preg_last_error();
$var = '';
if (@preg_match($pattern, $var) === false) {
$error = preg_last_error();
return [
'valid' => false,
'preg_error' => $error,
'error' => self::PREG_ERROR_MESSAGES[$error] ?? 'Unknown error',
'pcre_error' => preg_last_error_msg(),
];
}
return ['valid' => true, 'preg_error' => PREG_NO_ERROR, 'error' => null, 'pcre_error' => null];
}
}
// __END__