public class REProgram

  1. Object
  2. REProgram
A class that holds compiled regular expressions. You should not need to work directly with this class.

Constructors

public REProgram(char[] instruction)Constructs a program object from a character array
public REProgram(int parens, char[] instruction)Constructs a program object from a character array
public REProgram(char[] instruction, int lenInstruction)Constructs a program object from a character array

Methods

public char[] getInstructions()Returns a copy of the current regular expression program in a character array that is exactly the right length to hold the program.
public void setInstructions(char[] instruction, int lenInstruction)Sets a new regular expression program to run.
public char[] getPrefix()Returns a copy of the prefix of current regular expression program in a character array.

Inherited methods

From Object

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

Constructor details

REProgram

public REProgram(char[] instruction)
Constructs a program object from a character array

Parameters

instruction char[]
Character array with RE opcode instructions in it

REProgram

public REProgram(int parens, char[] instruction)
Constructs a program object from a character array

Parameters

parens int
Count of parens in the program
instruction char[]
Character array with RE opcode instructions in it

REProgram

public REProgram(char[] instruction, int lenInstruction)
Constructs a program object from a character array

Parameters

instruction char[]
Character array with RE opcode instructions in it
lenInstruction int
Amount of instruction array in use

Method details

getInstructions

public char[] getInstructions()
Returns a copy of the current regular expression program in a character array that is exactly the right length to hold the program. If there is no program compiled yet, getInstructions() will return null.

Returns

A copy of the current compiled RE program

setInstructions

public void setInstructions(char[] instruction, int lenInstruction)
Sets a new regular expression program to run. It is this method which performs any special compile-time search optimizations. Currently only two optimizations are in place - one which checks for backreferences (so that they can be lazily allocated) and another which attempts to find a prefix anchor string so that substantial amounts of input can potentially be skipped without running the actual program.

Parameters

instruction char[]
Program instruction buffer
lenInstruction int
Length of instruction buffer in use

getPrefix

public char[] 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