Regular Expressions in java

[kkk]

http://www.javaregex.com : Enables a java application or applet to
compile and use perl5 regular expressions. It also
provides tools to use the object-oriented capabilities of java to
extend these expressions simple ways. In addition, it provides a
special interface for globbing or matching file names.

 

[Lew]

<http://java.sun.com/javase/6/docs/api/java/util/regex/package-frame.html>

: Enables a java [sic] application or applet to
compile and use perl5 [sic] regular expressions.
It also provides tools to use the object-oriented capabilities of
java [sic] to extend these expressions simple ways.

What do you mean by "extend"?

In addition, it provides a special interface for globbing [?]
or matching file names.

What is "globbing"?

 

[Eric Sosman]

<http://java.sun.com/javase/6/docs/api/java/util/regex/package-frame.html>

[...]
In addition, it provides a special interface for globbing [?] or
matching file names.

What is "globbing"?

GIYF. ("Is there an echo in here?")

 

[Stefan Ram]

http://www.javaregex.com : Enables a java application or
applet to compile and use perl5 regular expressions.

|Regex r1=new Regex("\\w");

In Perl 5, one would write »\w«, not »\\w«.

(I know that this is impossible to implement
using a library in Java.)

 

[Joshua Cranmer]

In addition, it provides a special interface for globbing [?] or
matching file names.

What is "globbing"?

If you go into a bash shell, you can type stuff in like [234]*, which
would match all files in the current directory that start with 2, 3, or
4. Basically, you have [] (which acts the same as normal regex, although
I think only the abcdef and a-cx-z-esque forms are supported), ?, which
is equivalent to . in normal regex, and *, equivalent to .*

 

[Arne Vajhøj]

|Regex r1=new Regex("\\w");

In Perl 5, one would write »\w«, not »\\w«.

(I know that this is impossible to implement
using a library in Java.)

At the source code level. In the byte code Java contains
just the single slash.

Arne

 

[Roedy Green]

http://www.javaregex.com : Enables a java application or applet to
compile and use perl5 regular expressions.

As I understand it, Java Regex was designed to look like Perl regex.

What potentially could be appealing about your package are some aux
utilities:

1. regex proofreader
2. conversion from Perl to Java and back.
3. regex debugger so you can rapidly test a regex on a number of test
cases and figure out why strings are rejected.

see http://mindprod.com/project/regexcomposer.html
http://mindprod.com/project/regexdebugger.html
http://mindprod.com/project/regexproofreader.html
http://mindprod.com/project/regexutility.html
--
Roedy Green Canadian Mind Products
http://mindprod.com

No flying machine will ever fly from New York to Paris.
~ Orville Wright (born: 1871-08-19 died: 1948-10-30 at age: 77) 1908 We see that same conservative pessimism in those crafting today’s computers and computer tools. They are overwhelmed by the details of producing even today’s solutions. You need young, over-confident people who don’t know too much to chart the course ahead. This is especially true of global warming where the current generation has entirely given up hope of a green planet and sustainable human survival.

 

[Ross]

Isn't there regular expression handling built into Java by default?
I'm sure that I've done programming using regular expressions in Java
without having to use any external libraries.

Yes, it is. http://java.sun.com/docs/books/tutorial/essential/regex/

What does the new library supply that the built in library does not?