http://play.inginf.units.it solutions

RegexPlay.md

http://play.inginf.units.it/#/level/1

\d+

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http://play.inginf.units.it/#/level/2

(\w+)(\:\w+){5} (\w+:){5}\w+

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http://play.inginf.units.it/#/level/3

ftp://ftp\d?\d?\.?\w?\w?\.FreeBSD\.org/pub/FreeBSD/ ftp:\S+

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http://play.inginf.units.it/#/level/4

\$.+?\$

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http://play.inginf.units.it/#/level/5

\d+(\.\d+)+ (\d+\.){3}\d+

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http://play.inginf.units.it/#/level/6

href=(['"]).+?\1

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http://play.inginf.units.it/#/level/7

http://[\S]+(?:(?=\s|\.|\>)) (Not Working) http://[^ >]+[\w/]

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http://play.inginf.units.it/#/level/8

<h(\d)>?.+</h\1>

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http://play.inginf.units.it/#/level/9

\(?\d{3}\)?.\d{3}.\d{4} \(?\d+\)?[ -./]\d+[-.]\d+

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http://play.inginf.units.it/#/level/10

\w+\,\s.+?\w+ (Not Working) (?<=[{ ])\w+(-\w+)?,( [A-Z]\w*(({.+?}|')\w+)?)+

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http://play.inginf.units.it/#/level/11

(?<=<h(\d)>).+?(?=</h\1>) (Not Working) (?<=<h(\d).*?>).+(?=</h\1>)

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http://play.inginf.units.it/#/level/12

(?<=\d+\.\s)\w+\,\s[\.\w]+(?=[\,\:]) (?<=\. )\w+, (.\.)+

Shortest solution of level 3 is f.+D/

I found a shorter solution for Level 8:
<h\d.+

I got a Solution for Level 10(Without Positive "Lookbefore"'s):
([A-Z]\w+-)?[A-Z]\w+(,\s)A-Z?('Ona)?(\sA-Z?)?
PS: because in Safari Lookbefores don't work