Warnings: Improve regex for URLs

[ocean90]

New translation warning for Meta - WordPress.org Plugin Directory in Italian #it:
​*Warning:*​ The translation appears to be missing the following URLs: http://wordpress.org/plugins/<strong>demo-plugin-name</strong>
The translation contains the following unexpected URLs: http://wordpress.org/plugins/<strong>nome-del-plugin-dimostrativo</strong>
    ​*Original:*​ For example: "Demo Plugin Name" will become http://wordpress.org/plugins/<strong>demo-plugin-name</strong>
    ​*Translation:*​ Per esempio: "Nome del plugin dimostrativo" diventerà http://wordpress.org/plugins/<strong>nome-del-plugin-dimostrativo</strong>

we can probably just whitelist [a-z0-9/] as the last character or something

​https://wordpress.slack.com/archives/meta-i18n/p1447285320000081

[garrett-eclipse]

I just wanted to update the ticket to log another case on this as it's slightly different, basically in my case the URL check took into account the carriage return at the end of the URL and flagged it as the URL was missing. See screen;

I guess this string has a check to make sure the URL is present. And it's failing that check only because there's a carriage return at the end of the URL.
Permalink - ​https://translate.wordpress.org/projects/wp-plugins/ewww-image-optimizer/stable-readme/en-ca/default?filters%5Bstatus%5D=either&filters%5Boriginal_id%5D=1343816&filters%5Btranslation_id%5D=48536791

I see this as a Glotpress issue cause it's URL lookup is taking into account the carriage return.

Hope this is helpful.
Cheers

[ocean90]

#2949 was marked as a duplicate.

[ocean90]

In 7314:

Translate, Custom Warnings: Add a whitelist for the last URL character to reduce the number of false-positives for mismatching URLs.

Fixes #1401.