Replace URL String with Integer characters located in the end of that String

Question

I have some URL link and tried to replace all non-integer values with integers in the end of the link using regex

The URL is something like

https://some.storage.com/test123456.bucket.com/folder/80.png

Regex i tried to use:

Integer.parseInt(string.replaceAll(".*[^\\d](\\d+)", "$1"))

Output for that regex is "80.png", and i need only "80". Also i tried this tool - https://regex101.com. And as i see the main problem is that ".png" not matching with my regex and then, after substitution, this part adding to matching group.

I'm totally noob in regex, so i kindly ask you for help.

Is the pattern of your urls always ending with digits followed by non digits? — dryleaf
– dryleaf, Commented Jan 12, 2020 at 10:26

Wiktor Stribiżew · Accepted Answer · 2020-01-12 20:32:27Z

1

You may use

String result = string.replaceAll("(?:.*\\D)?(\\d+).*", "$1");

See the regex demo.

NOTE: If there is no match, the result will be equal to the string value. If you do not want this behavior, instead of "(?:.*\\D)?(\\d+).*", use "(?:.*\\D)?(\\d+).*|.+".

Details

(?:.*\D)? - an optional (it must be optional because the Group 1 pattern might also be matched at the start of the string) sequence of
- .* - any 0+ chars other than line break chars, as many as possible
- \D - a non-digit
(\d+) - Group 1: any one or more digits
.* - any 0+ chars other than line break chars, as many as possible

The replacement is $1, the backreference to Group 1 value, actually, the last 1+ digit chunk in the string that has no line breaks.

Line breaks can be supported if you prepend the pattern with the (?s) inline DOTALL modifier, i.e. "(?s)(?:.*\\D)?(\\d+).*|.+".

answered Jan 12, 2020 at 20:32

Wiktor Stribiżew

631k41 gold badges502 silver badges632 bronze badges

Sign up to request clarification or add additional context in comments.

1 Comment

Lordix Games Over a year ago

Thank you very much for the detailed answer, @Wiktor Stribiżew :)

Collectives™ on Stack Overflow

Replace URL String with Integer characters located in the end of that String

1 Answer 1

1 Comment

Your Answer

Hot Network Questions

Collectives™ on Stack Overflow

1 Answer 1

1 Comment

Your Answer

Sign up or log in

Post as a guest

Related