CODEWITHSUNDEEP
regexstring
kristjanzzz
kristjanzzz

Reputation: 67

Regex string transformation/extraction

Code:

https://aaa.bbb.net/ccc/211099_589944494365122_1446403980_n.jpg

How can I get 589944494365122 out of that string using regex?

The best I can do so far is _(.*) resulting 589944494365122_1446403980_n.jpg

Upvotes: 0

Views: 143

Answers (4)

Ivaylo Strandjev
Ivaylo Strandjev

Reputation: 71019

I would go with \d+_(\d+)_\d+_n\.jpg, but depending on the exact specification of the URL this may need a little bit of tweaking.

Also depending on the language, this may need to be altered a little bit. The solution I suggest will work for instance in Ruby (as well as many other regex implementations). Here \d matches any digit and \d+ means one or more digits. I assume the letter before .jpg is always n but you may change this by either replacing n with .(any character) or with \w (any word character).

Upvotes: 1

Kerem
Kerem

Reputation: 11586

This works;

var s = "https://aaa.bbb.net/ccc/211099_589944494365122_1446403980_n.jpg";
var m = /_([^_]*)/.exec(s);
console.log( m[1] ); // 589944494365122

Upvotes: 1

Kent
Kent

Reputation: 195289

The rule of extraction I can see in your input is:

211099_589944494365122_1446403980
[0-9]+_ part we want  _[0-9]+

so a regex with look-behind and look-ahead will help:

'(?<=\d_)\d+(?=_\d)'

test with grep:

kent$  echo " https://aaa.bbb.net/ccc/211099_589944494365122_1446403980_n.jpg"|grep -Po '(?<=\d_)\d+(?=_\d)'
589944494365122

Upvotes: 1

Anton Kovalenko
Anton Kovalenko

Reputation: 21517

First, you should generalize your problem description, like that: How can I get the longest non-empty substring of digits after the first _ in string? The regexp you literally asked for is (589944494365122), but that's not what you expect.

According to my guess about what you want, the answer could be _(\d+).

Upvotes: 2

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