Regular Expression to a Java.regex.Pattern

Question

I'm working with the IPV6 address space to have our java app accept the IPV6 standard. I've written a regular expression that is tested and working.

((([0-9A-Fa-f]{1,4}:){7}([0-9A-Fa-f]{1,4}|:))|(([0-9A-Fa-f]{1,4}:){6}(:[0-9A-Fa-f]{1,4}|((25[0-5]|2[0-4]\d|1\d\d|[1-9]?\d)(\.(25[0-5]|2[0-4]\d|1\d\d|[1-9]?\d)){3})|:))|(([0-9A-Fa-f]{1,4}:){5}((:[0-9A-Fa-f]{1,4}){1,2}|:((25[0-5]|2[0-4]\d|1\d\d|[1-9]?\d)(\.(25[0-5]|2[0-4]\d|1\d\d|[1-9]?\d)){3})|:))|(([0-9A-Fa-f]{1,4}:){4}((:[0-9A-Fa-f]{1,4}){1,3})|((:[0-9A-Fa-f]{1,4})?:((25[0-5]|2[0-4]\d|1\d\d|[1-9]?\d)(\.(25[0-5]|2[0-4]\d|1\d\d|[1-9]?\d)){3}))|:)|(([0-9A-Fa-f]{1,4}:){3}|(((:[0-9A-Fa-f]{1,4}){0,2}:((25[0-5]|2[0-4]\d|1\d\d|[1-9]?\d)(\.(25[0-5]|2[0-4]\d|1\d\d|[1-9]?\d)){3}))|:))|(([0-9A-Fa-f]{1,4}:){2}((:[0-9A-Fa-f]{1,4}){1,5})|((:[0-9A-Fa-f]{1,4}){0,3}:((25[0-5]|2[0-4]\d|1\d\d|[1-9]?\d)(\.(25[0-5]|2[0-4]\d|1\d\d|[1-9]?\d)){3}))|:)|(([0-9A-Fa-f]{1,4}:){1}(((:[0-9A-Fa-f]{1,4}){1,6})|((:[0-9A-Fa-f]{1,4}){0,4}:((25[0-5]|2[0-4]\d|1\d\d|[1-9]?\d)(\.(25[0-5]|2[0-4]\d|1\d\d|[1-9]?\d)){3}))|:))|((:[0-9A-Fa-f]{1,4}){1,7}|((:[0-9A-Fa-f]{1,4}){0,5}:((25[0-5]|2[0-4]\d|1\d\d|[1-9}?\d)(\.(25[0-5]|2[0-4]\d|1\d\d|[1-9]?\d)){3})|:))

Can anyone tell me how to get this working with the proper escapes to compile as a Java pattern?

How did you test this? Not in Java?

wkl
– wkl

2011-06-15 01:22:21 +00:00
Commented Jun 15, 2011 at 1:22 — wkl
– wkl, Commented Jun 15, 2011 at 1:22
and now you have two problems :)

Gareth Davis
– Gareth Davis

2011-06-15 08:23:33 +00:00
Commented Jun 15, 2011 at 8:23 — Gareth Davis
– Gareth Davis, Commented Jun 15, 2011 at 8:23

C. K. Young · Accepted Answer · 2011-06-15 01:33:20Z

2

Use this:

Pattern.compile("((([0-9A-Fa-f]{1,4}:){7}([0-9A-Fa-f]{1,4}|:))|(([0-9A-Fa-f]{1,4}:){6}(:[0-9A-Fa-f]{1,4}|((25[0-5]|2[0-4]\\d|1\\d\\d|[1-9]?\\d)(\\.(25[0-5]|2[0-4]\\d|1\\d\\d|[1-9]?\\d)){3})|:))|(([0-9A-Fa-f]{1,4}:){5}((:[0-9A-Fa-f]{1,4}){1,2}|:((25[0-5]|2[0-4]\\d|1\\d\\d|[1-9]?\\d)(\\.(25[0-5]|2[0-4]\\d|1\\d\\d|[1-9]?\\d)){3})|:))|(([0-9A-Fa-f]{1,4}:){4}((:[0-9A-Fa-f]{1,4}){1,3})|((:[0-9A-Fa-f]{1,4})?:((25[0-5]|2[0-4]\\d|1\\d\\d|[1-9]?\\d)(\\.(25[0-5]|2[0-4]\\d|1\\d\\d|[1-9]?\\d)){3}))|:)|(([0-9A-Fa-f]{1,4}:){3}|(((:[0-9A-Fa-f]{1,4}){0,2}:((25[0-5]|2[0-4]\\d|1\\d\\d|[1-9]?\\d)(\\.(25[0-5]|2[0-4]\\d|1\\d\\d|[1-9]?\\d)){3}))|:))|(([0-9A-Fa-f]{1,4}:){2}((:[0-9A-Fa-f]{1,4}){1,5})|((:[0-9A-Fa-f]{1,4}){0,3}:((25[0-5]|2[0-4]\\d|1\\d\\d|[1-9]?\\d)(\\.(25[0-5]|2[0-4]\\d|1\\d\\d|[1-9]?\\d)){3}))|:)|(([0-9A-Fa-f]{1,4}:){1}(((:[0-9A-Fa-f]{1,4}){1,6})|((:[0-9A-Fa-f]{1,4}){0,4}:((25[0-5]|2[0-4]\\d|1\\d\\d|[1-9]?\\d)(\\.(25[0-5]|2[0-4]\\d|1\\d\\d|[1-9]?\\d)){3}))|:))|((:[0-9A-Fa-f]{1,4}){1,7}|((:[0-9A-Fa-f]{1,4}){0,5}:((25[0-5]|2[0-4]\\d|1\\d\\d|[1-9]?\\d)(\\.(25[0-5]|2[0-4]\\d|1\\d\\d|[1-9]?\\d)){3})|:)))")

Summary of changes:

All backslashes are doubled.
There is a typo of [1-9} in your pattern. That is fixed.
Your pattern is also missing a final closing parenthesis.

answered Jun 15, 2011 at 1:33

C. K. Young

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2 Comments

C. K. Young Over a year ago

@Alan: Indeed. All I did was load up the regex using Pattern.compile (in JRuby, so I can use single-quoted strings and thus not get stung on the single backslashes), and keep fixing the pattern until the compile call returns successfully. :-)

April_Nara Over a year ago

Chris this works wonderfully with a clean pattern compile. Appreciate the quick accurate reply. Thanks again.

Rangi Lin · Accepted Answer · 2011-06-15 01:24:17Z

0

If you are asking how to escape in order to make this regular expression works. You can check "Escape Sequence" section of this tutorial for better explaination

Characters

answered Jun 15, 2011 at 1:24

Rangi Lin

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jefflunt · Accepted Answer · 2011-06-15 01:25:31Z

0

Check out the official API docs, specifically the Pattern class (which has a list of escape characters, and other stuff specific to the Java implementation of Regex), and the java.util.regex package documentation in general.

This site has been one of my favorites for regex reference, and has some details on some of the Java-specific regex quirks.

answered Jun 15, 2011 at 1:25

jefflunt

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1 Comment

April_Nara Over a year ago

Thank you but I did actually view those exact sites. I think Chris's suggest might do the trick.

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