net.sf.saxon.functions.regex

Class JRegularExpression

java.lang.Object

net.sf.saxon.functions.regex.JRegularExpression

All Implemented Interfaces:

Serializable, RegularExpression

public class JRegularExpression
extends Object
implements RegularExpression

A compiled regular expression implemented using the Java JDK regex package

See Also:

Serialized Form

Field Summary

Fields

Modifier and Type	Field and Description
(package private) int	flagBits
(package private) String	javaRegex
(package private) Pattern	pattern

Fields inherited from interface net.sf.saxon.functions.regex.RegularExpression

EXPAND_COMPLEMENT_BLOCKS, JAVA_SYNTAX, XML11, XPATH20, XPATH30

Constructor Summary

Constructors

Constructor and Description
JRegularExpression(CharSequence regex, int options, int flagBits) Create (compile) a regular expression
JRegularExpression(String javaRegex, int flagBits) Create a regular expression, starting with an already-translated Java regex.

Method Summary

Modifier and Type	Method and Description
RegexIterator	analyze(CharSequence input) Use this regular expression to analyze an input string, in support of the XSLT analyze-string instruction.
boolean	containsMatch(CharSequence input) Determine whether the regular expression contains a match for a given string
int	getFlagBits() Get the flag bits as used by the Java regular expression engine
String	getJavaRegularExpression() Get the Java regular expression (after translation from an XPath regex, but before compilation)
static void	main(String[] args)
boolean	matches(CharSequence input) Determine whether the regular expression match a given string in its entirety
CharSequence	replace(CharSequence input, CharSequence replacement) Replace all substrings of a supplied input string that match the regular expression with a replacement string.
static int	setFlags(CharSequence inFlags) Set the Java flags from the supplied XPath flags.
SequenceIterator	tokenize(CharSequence input) Use this regular expression to tokenize an input string.

Methods inherited from class java.lang.Object

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

Field Detail

pattern

Pattern pattern

javaRegex

String javaRegex

flagBits

int flagBits

Constructor Detail

JRegularExpression

public JRegularExpression(String javaRegex,
                          int flagBits)

Create a regular expression, starting with an already-translated Java regex. NOTE: this constructor is called from compiled XQuery code

Parameters:

javaRegex - the regular expression after translation to Java notation

flagBits - the option bits, derived from the user-specified flags

JRegularExpression

public JRegularExpression(CharSequence regex,
                          int options,
                          int flagBits)
                   throws XPathException

Create (compile) a regular expression

Parameters:

regex - the source text of the regular expression, in XML Schema or XPath syntax

options - flags indicting the regex dialect accepted

flagBits - the flags argument translated to the Java bit-significant integer representation

Throws:

XPathException - if the syntax of the regular expression or flags is incorrect

Method Detail

getJavaRegularExpression

public String getJavaRegularExpression()

Get the Java regular expression (after translation from an XPath regex, but before compilation)

Returns:

the regular expression in Java notation

getFlagBits

public int getFlagBits()

Get the flag bits as used by the Java regular expression engine

Returns:

the flag bits

analyze

public RegexIterator analyze(CharSequence input)

Use this regular expression to analyze an input string, in support of the XSLT analyze-string instruction. The resulting RegexIterator provides both the matching and non-matching substrings, and allows them to be distinguished. It also provides access to matched subgroups.

Specified by:

analyze in interface RegularExpression

Parameters:

input - the character string to be analyzed using the regular expression

Returns:

an iterator over matched and unmatched substrings

containsMatch

public boolean containsMatch(CharSequence input)

Determine whether the regular expression contains a match for a given string

Specified by:

containsMatch in interface RegularExpression

Parameters:

input - the string to match

Returns:

true if the string matches, false otherwise

matches

public boolean matches(CharSequence input)

Determine whether the regular expression match a given string in its entirety

Specified by:

matches in interface RegularExpression

Parameters:

input - the string to match

Returns:

true if the string matches, false otherwise

replace

public CharSequence replace(CharSequence input,
                            CharSequence replacement)
                     throws XPathException

Replace all substrings of a supplied input string that match the regular expression with a replacement string.

Specified by:

replace in interface RegularExpression

Parameters:

input - the input string on which replacements are to be performed

replacement - the replacement string in the format of the XPath replace() function

Returns:

the result of performing the replacement

Throws:

XPathException - if the replacement string is invalid

tokenize

public SequenceIterator tokenize(CharSequence input)

Use this regular expression to tokenize an input string.

Specified by:

tokenize in interface RegularExpression

Parameters:

input - the string to be tokenized

Returns:

a SequenceIterator containing the resulting tokens, as objects of type StringValue

setFlags

public static int setFlags(CharSequence inFlags)
                    throws XPathException

Set the Java flags from the supplied XPath flags.

Parameters:

inFlags - the flags as a string, e.g. "im"

Returns:

the flags as a bit-significant integer

Throws:

XPathException - if the supplied value is invalid

main

public static void main(String[] args)