edu.washington.cs.knowitall.sequence

Class RegexTagger

java.lang.Object

edu.washington.cs.knowitall.sequence.RegexTagger

public class RegexTagger
extends Object

A class for tagging a sequence using a LayeredTokenPattern pattern. The tagger is defined by a pattern and a tag. Given a LayeredSequence object, the tag(LayeredSequence) method will return a list of strings, where each string is either the tag, or the OUT_TAG symbol.

For example, given the sequence "she sells sea shells by the shore", the tag symbol "X" and a regular expression that matches the words starting with s, the tagger will return the list [X, X, X, X, O, O, X].

Author:

afader

Field Summary

Fields

Modifier and Type	Field and Description
static String	OUT_TAG The symbol used to represent a token that did not match the pattern.

Constructor Summary

Constructors

Constructor and Description
RegexTagger(LayeredTokenPattern pattern, String tag)

Method Summary

Methods

Modifier and Type	Method and Description
List<String>	tag(LayeredSequence seq)

Methods inherited from class java.lang.Object

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

Field Detail

OUT_TAG

public static final String OUT_TAG

The symbol used to represent a token that did not match the pattern.

See Also:

Constant Field Values

Constructor Detail

RegexTagger

public RegexTagger(LayeredTokenPattern pattern,
           String tag)

Parameters:

pattern - the regular expression to match

tag - the tag to use for matching tokens

Method Detail

tag

public List<String> tag(LayeredSequence seq)
                 throws SequenceException

Parameters:

seq -

Returns:

the tagged result

Throws:

SequenceException - if unable to match against seq