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
UnicodeString	getPrefix() Returns a copy of the prefix of current regular expression program in a character array.
boolean	isNullable() Ask whether the regular expression matches a zero length string

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

isNullable

public boolean isNullable()

Ask whether the regular expression matches a zero length string

Returns:

true if the regex matches a zero length string

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