gnu.regexp

Class REMatch

public final class REMatch extends Object implements Serializable, Cloneable

An instance of this class represents a match completed by a gnu.regexp matching function. It can be used to obtain relevant information about the location of a match or submatch.

Author: Wes Biggs

Field Summary
int	anchor
int	eflags
int[]	end
int	index
REMatch	next
int	offset
int[]	start

Constructor Summary
	REMatch(int subs, int anchor, int eflags)

Method Summary
void	assignFrom(REMatch other)
void	clear(int index) Clears the current match and moves the offset to the new index.
Object	clone()
void	finish(CharIndexed text)
int	getEndIndex() Returns the index within the input string where the match in its entirety ends.
int	getEndIndex(int sub) Returns the index within the input string used to generate this match where subexpression number sub ends, or `-1` if the subexpression does not exist.
int	getStartIndex() Returns the index within the input text where the match in its entirety began.
int	getStartIndex(int sub) Returns the index within the input string used to generate this match where subexpression number sub begins, or `-1` if the subexpression does not exist.
int	getSubEndIndex(int sub) Returns the index within the input string used to generate this match where subexpression number sub ends, or `-1` if the subexpression does not exist.
int	getSubStartIndex(int sub) Returns the index within the input string used to generate this match where subexpression number sub begins, or `-1` if the subexpression does not exist.
String	substituteInto(String input) Substitute the results of this match to create a new string.
String	toString() Returns the string matching the pattern.
String	toString(int sub) Returns the string matching the given subexpression.

Field Detail

Constructor Detail

REMatch

REMatch(int subs, int anchor, int eflags)

Method Detail

clear

void clear(int index)

Clears the current match and moves the offset to the new index.

getEndIndex

public int getEndIndex()

Returns the index within the input string where the match in its entirety ends. The return value is the next position after the end of the string; therefore, a match created by the following call:

REMatch myMatch = myExpression.getMatch(myString);

can be viewed (given that myMatch is not null) by creating

String theMatch = myString.substring(myMatch.getStartIndex(), myMatch.getEndIndex());

But you can save yourself that work, since the toString() method (above) does exactly that for you.

getEndIndex

public int getEndIndex(int sub)

Returns the index within the input string used to generate this match where subexpression number sub ends, or -1 if the subexpression does not exist. The initial position is zero.

Parameters: sub Subexpression index

getStartIndex

public int getStartIndex()

Returns the index within the input text where the match in its entirety began.

getStartIndex

public int getStartIndex(int sub)

Returns the index within the input string used to generate this match where subexpression number sub begins, or -1 if the subexpression does not exist. The initial position is zero.

Parameters: sub Subexpression index

Since: gnu.regexp 1.1.0

getSubEndIndex

public int getSubEndIndex(int sub)

Deprecated: Use getEndIndex(int) instead

Returns the index within the input string used to generate this match where subexpression number sub ends, or -1 if the subexpression does not exist. The initial position is zero.

Parameters: sub Subexpression index

getSubStartIndex

public int getSubStartIndex(int sub)

Deprecated: Use getStartIndex(int) instead.

Returns the index within the input string used to generate this match where subexpression number sub begins, or -1 if the subexpression does not exist. The initial position is zero.

Parameters: sub Subexpression index

substituteInto

public String substituteInto(String input)

Substitute the results of this match to create a new string. This is patterned after PERL, so the tokens to watch out for are $0 through $9. $0 matches the full substring matched; $n matches subexpression number n.

Parameters: input A string consisting of literals and $n tokens.

toString

public String toString()

Returns the string matching the pattern. This makes it convenient to write code like the following:

REMatch myMatch = myExpression.getMatch(myString); if (myMatch != null) System.out.println("Regexp found: "+myMatch);

toString

public String toString(int sub)

Returns the string matching the given subexpression. The subexpressions are indexed starting with one, not zero. That is, the subexpression identified by the first set of parentheses in a regular expression could be retrieved from an REMatch by calling match.toString(1).

Parameters: sub Index of the subexpression.