find the path param using regex in the url

Question

what is the regular expression to find the path param from the url?

http://localhost:8080/domain/v1/809pA8
https://localhost:8080/domain/v1/809pA8

Want to retrieve the value(809pA8) from the above URL using regular expression, java is preferable.

What have you tried yet? Have you looked at alternative approaches based on simple String functions? — reto
– reto, Commented Feb 12, 2015 at 8:46
Could the url be localhost:8080/domain/v1/809pA8?arg1=val1, or localhost:8080/domain/v1/809pA8/articles? — Carlos Verdes
– Carlos Verdes, Commented Feb 12, 2015 at 9:06
user3157090, you have posted 49 questions, the majority of which have perfectly valid answers. You should concider going back and marking the best ones as accepted. — aioobe
– aioobe, Commented Feb 13, 2015 at 9:00

aioobe · Accepted Answer · 2015-02-12 08:46:29Z

4

I would suggest you do something like

url.substring(url.lastIndexOf('/') + 1);

If you really prefer regexps, you could do

Matcher m = Pattern.compile("/([^/]+)$").matcher(url);

if (m.find())
    value = m.group(1);

answered Feb 12, 2015 at 8:46

aioobe

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2 Comments

user3157090 Over a year ago

prefer regular expression.

GoBusto Over a year ago

Why? This problem isn't really complicated enough to require regular expressions.

Fourat · Accepted Answer · 2015-02-12 09:29:25Z

1

I would try:

String url = "http://localhost:8080/domain/v1/809pA8";
String value = String.valueOf(url.subSequence(url.lastIndexOf('/'), url.length()-1));

No need for regex here, I think.

EDIT: I'm sorry I made a mistake:

String url = "http://localhost:8080/domain/v1/809pA8";
    String value = String.valueOf(url.subSequence(url.lastIndexOf('/')+1, url.length()));

See this code working here: https://ideone.com/E30ddC

edited Feb 12, 2015 at 9:29

answered Feb 12, 2015 at 8:52

Fourat

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3 Comments

aioobe Over a year ago

This is wrong since the end index (second argument to subSequence) is exclusive. This solution misses the last character.

aioobe Over a year ago

So, why use CharSequence.subSequence instead of String.substring? For String.substring the end index is optional (and you wouldn't have to use String.valueOf).

Fourat Over a year ago

It's just a way of doing things, the answer before mine was about String substring, I think it's better to give another solution better than repeat the one given before.

kaqqao · Accepted Answer · 2015-02-12 09:11:41Z

0

For your simple case, regex is an overkill, as others noted. But, if you have more cases and this is why you prefer regex, give Spring's AntPathMatcher#extractUriTemplateVariables a look, if you're using Spring. It's actually better equipped for extracting path variables than regex directly. Here are some good examples.

answered Feb 12, 2015 at 9:11

kaqqao

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