net.sf.saxon.regex

Class REProgram

java.lang.Object

net.sf.saxon.regex.REProgram

public class REProgram
extends java.lang.Object

A class that holds compiled regular expressions.

Constructor Summary

Constructors

Constructor and Description
REProgram(Operation operation, int parens, REFlags flags) Constructs a program object from a character array

Method Summary

Modifier and Type	Method and Description
int	getBacktrackingLimit()
UnicodeString	getPrefix() Returns a copy of the prefix of current regular expression program in a character array.
boolean	isNullable() Ask whether the regular expression is known statically to match a zero length string
void	setBacktrackingLimit(int limit)

Methods inherited from class java.lang.Object

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

Constructor Detail

REProgram

public REProgram(Operation operation,
                 int parens,
                 REFlags flags)

Constructs a program object from a character array

Parameters:

operation - Array with RE opcode instructions in it. The "next"

parens - Count of parens in the program pointers within the operations must already have been converted to absolute offsets.

flags - the regular expression flags

Method Detail

setBacktrackingLimit

public void setBacktrackingLimit(int limit)

getBacktrackingLimit

public int getBacktrackingLimit()

isNullable

public boolean isNullable()

Ask whether the regular expression is known statically to match a zero length string

Returns:

true if the regex is known statically to match a zero length string. If the result is true, then there is definitely a match; if the result is false, then it is not known statically whether there is a match (this arises when the expression contains back-references).

getPrefix

public UnicodeString getPrefix()

Returns a copy of the prefix of current regular expression program in a character array. If there is no prefix, or there is no program compiled yet, getPrefix will return null.

Returns:

A copy of the prefix of current compiled RE program