Package org.keycloak.utils

Class RegexUtils

java.lang.Object

org.keycloak.utils.RegexUtils

public class RegexUtils
extends Object

Utility methods for validating and matching regular expressions.

Field Summary

Fields

Modifier and Type	Field	Description
static final int	DEFAULT_MAX_LENGTH	Default maximum regex length — limits complexity to mitigate ReDoS attacks.

Constructor Summary

Constructors

Constructor	Description
RegexUtils()

Method Summary

Modifier and Type	Method	Description
static boolean	isValidRegex(String regexp)	Validates whether the given string is a syntactically valid regular expression with a maximum length of DEFAULT_MAX_LENGTH and groups allowed.
static boolean	isValidRegex(String regexp, int maxLength, boolean allowGroups)	Validates whether the given string is a syntactically valid regular expression.
static boolean	valueMatchesRegex(String regex, Object value)

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Field Details

DEFAULT_MAX_LENGTH

public static final int DEFAULT_MAX_LENGTH

Default maximum regex length — limits complexity to mitigate ReDoS attacks.

See Also:

• Constant Field Values

Constructor Details

RegexUtils

public RegexUtils()

Method Details

isValidRegex

public static boolean isValidRegex(String regexp)

Validates whether the given string is a syntactically valid regular expression with a maximum length of DEFAULT_MAX_LENGTH and groups allowed.

Parameters:

regexp - the regular expression to validate

Returns:

true if the expression is valid, false otherwise

isValidRegex

public static boolean isValidRegex(String regexp,
 int maxLength,
 boolean allowGroups)

Validates whether the given string is a syntactically valid regular expression.

Parameters:

regexp - the regular expression to validate

maxLength - the maximum allowed length of the expression

allowGroups - whether capturing and non-capturing groups (parentheses) are permitted

Returns:

true if the expression is valid, false if it is null, exceeds maxLength, contains groups when disallowed, or has invalid syntax

valueMatchesRegex

public static boolean valueMatchesRegex(String regex,
 Object value)