org.htmlparser.filters

类 RegexFilter

java.lang.Object

org.htmlparser.filters.RegexFilter

所有已实现的接口:

java.io.Serializable, java.lang.Cloneable, NodeFilter

public class RegexFilter
extends java.lang.Object
implements NodeFilter

This filter accepts all string nodes matching a regular expression. Because this searches Text nodes. it is only useful for finding small fragments of text, where it is unlikely to be broken up by a tag. To find large fragments of text you should convert the page to plain text with something like the StringBean and then apply the regular expression.

For example, to look for dates use:

   (19|20)\d\d([- \\/.](0[1-9]|1[012])[- \\/.](0[1-9]|[12][0-9]|3[01]))?
 

as in:

 Parser parser = new Parser ("http://cbc.ca");
 RegexFilter filter = new RegexFilter ("(19|20)\\d\\d([- \\\\/.](0[1-9]|1[012])[- \\\\/.](0[1-9]|[12][0-9]|3[01]))?");
 NodeIterator iterator = parser.extractAllNodesThatMatch (filter).elements ();
 

which matches a date in yyyy-mm-dd format between 1900-01-01 and 2099-12-31, with a choice of five separators, either a dash, a space, either kind of slash or a period. The year is matched by (19|20)\d\d which uses alternation to allow the either 19 or 20 as the first two digits. The round brackets are mandatory. The month is matched by 0[1-9]|1[012], again enclosed by round brackets to keep the two options together. By using character classes, the first option matches a number between 01 and 09, and the second matches 10, 11 or 12. The last part of the regex consists of three options. The first matches the numbers 01 through 09, the second 10 through 29, and the third matches 30 or 31. The day and month are optional, but must occur together because of the ()? bracketing after the year.

另请参阅:

序列化表格

字段概要

字段

限定符和类型	字段和说明
static int	FIND Use find() match strategy.
static int	LOOKINGAT Use lookingAt() match strategy.
static int	MATCH Use match() matching strategy.

构造器概要

构造器

构造器和说明
RegexFilter() Creates a new instance of RegexFilter that accepts string nodes matching the regular expression ".*" using the FIND strategy.
RegexFilter(java.lang.String pattern) Creates a new instance of RegexFilter that accepts string nodes matching a regular expression using the FIND strategy.
RegexFilter(java.lang.String pattern, int strategy) Creates a new instance of RegexFilter that accepts string nodes matching a regular expression.

方法概要

限定符和类型	方法和说明
boolean	accept(Node node) Accept string nodes that match the regular expression.
java.lang.String	getPattern() Get the search pattern.
int	getStrategy() Get the search strategy.
void	setPattern(java.lang.String pattern) Set the search pattern.
void	setStrategy(int strategy) Set the search pattern.

从类继承的方法 java.lang.Object

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

字段详细资料

MATCH

public static final int MATCH

Use match() matching strategy.

另请参阅:

常量字段值

LOOKINGAT

public static final int LOOKINGAT

Use lookingAt() match strategy.

另请参阅:

常量字段值

FIND

public static final int FIND

Use find() match strategy.

另请参阅:

常量字段值

构造器详细资料

RegexFilter

public RegexFilter()

Creates a new instance of RegexFilter that accepts string nodes matching the regular expression ".*" using the FIND strategy.

RegexFilter

public RegexFilter(java.lang.String pattern)

Creates a new instance of RegexFilter that accepts string nodes matching a regular expression using the FIND strategy.

参数:

pattern - The pattern to search for.

RegexFilter

public RegexFilter(java.lang.String pattern,
                   int strategy)

Creates a new instance of RegexFilter that accepts string nodes matching a regular expression.

参数:

pattern - The pattern to search for.

strategy - The type of match:

1. MATCH use matches() method: attempts to match the entire input sequence against the pattern
2. LOOKINGAT use lookingAt() method: attempts to match the input sequence, starting at the beginning, against the pattern
3. FIND use find() method: scans the input sequence looking for the next subsequence that matches the pattern

方法详细资料

getPattern

public java.lang.String getPattern()

Get the search pattern.

返回:

Returns the pattern.

setPattern

public void setPattern(java.lang.String pattern)

Set the search pattern.

参数:

pattern - The pattern to set.

getStrategy

public int getStrategy()

Get the search strategy.

返回:

Returns the strategy.

setStrategy

public void setStrategy(int strategy)

Set the search pattern.

参数:

strategy - The strategy to use. One of MATCH, LOOKINGAT or FIND.

accept

public boolean accept(Node node)

Accept string nodes that match the regular expression.

指定者:

accept 在接口中 NodeFilter

参数:

node - The node to check.

返回:

true if the regular expression matches the text of the node, false otherwise.