Package org.vaadin.miki.util

Class RegexTools

java.lang.Object

org.vaadin.miki.util.RegexTools

public class RegexTools
extends Object

Tools related to regular expressions.

Since:

2023-05-05

Author:

miki

Field Summary

Fields

Modifier and Type	Field	Description
static final Set<Character>	CHARACTERS_TO_ESCAPE_ONLY_IN_CHAR_SELECTOR
static final Set<Character>	CHARACTERS_TO_ESCAPE_OUTSIDE_CHAR_SELECTOR	Characters that need to be escaped in a regular expression.

Method Summary

Modifier and Type	Method	Description
static String	characterSelector(char main, char... alternatives)	Builds a regular expression that is a selector for a given character(s).
static String	characterSelector(char mainCharacter, Collection<Character> alternatives)	Builds a regular expression that is a selector for a given character(s).
static StringBuilder	characterSelector(StringBuilder builder, char mainCharacter, Collection<Character> alternatives)	Appends to a given builder a regular expression that is a selector for a given character(s).
static String	escaped(char character)	Escapes the character if it needs to in a regular expression that is part of a character selector.
static String	escaped(char character, boolean insideCharSelector)	Escapes the character if it needs to in a regular expression.

Methods inherited from class java.lang.Object

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

Field Details

CHARACTERS_TO_ESCAPE_OUTSIDE_CHAR_SELECTOR

public static final Set<Character> CHARACTERS_TO_ESCAPE_OUTSIDE_CHAR_SELECTOR

Characters that need to be escaped in a regular expression.

CHARACTERS_TO_ESCAPE_ONLY_IN_CHAR_SELECTOR

public static final Set<Character> CHARACTERS_TO_ESCAPE_ONLY_IN_CHAR_SELECTOR

Method Details

escaped

public static String escaped(char character)

Escapes the character if it needs to in a regular expression that is part of a character selector. This is the same as calling escaped(character, true).

Parameters:

character - Character to escape.

Returns:

Escaped character (if needed), otherwise the passed character.

See Also:

• escaped(char, boolean)

escaped

public static String escaped(char character,
 boolean insideCharSelector)

Escapes the character if it needs to in a regular expression.

Parameters:

character - Character to escape.

insideCharSelector - If true, CHARACTERS_TO_ESCAPE_ONLY_IN_CHAR_SELECTOR will be used to check if a character needs to be escaped; otherwise CHARACTERS_TO_ESCAPE_OUTSIDE_CHAR_SELECTOR will be used.

Returns:

Escaped character (if needed), otherwise the passed character.

characterSelector

public static StringBuilder characterSelector(StringBuilder builder,
 char mainCharacter,
 Collection<Character> alternatives)

Appends to a given builder a regular expression that is a selector for a given character(s).

Parameters:

builder - Builder to add the regular expression to.

mainCharacter - The character to select.

alternatives - Eventual alternatives.

Returns:

The passed builder.

characterSelector

public static String characterSelector(char mainCharacter,
 Collection<Character> alternatives)

Builds a regular expression that is a selector for a given character(s).

Parameters:

mainCharacter - The character to select.

alternatives - Eventual alternatives.

Returns:

A regular expression that matches the character or its alternatives.

characterSelector

public static String characterSelector(char main,
 char... alternatives)

Builds a regular expression that is a selector for a given character(s).

Parameters:

main - The character to select.

alternatives - Eventual alternatives.

Returns:

A regular expression that matches the character or its alternatives.