Challenges : http://play.inginf.units.it
Note: Comment down if you could improvise it..
1
/d+
2
([\da-f]{2}:?){6}
3
\w+://[\w\./]+
4
\$\\?[\w_\\{}='\s\+]+\$
5
((\d\.?){1,3}){6}
6
href=('|")[\w\S]+("|')
7
http://[\w\./\?=&~;://-]+(\w|/)
8
<h[1-6].*h[1-6]>
9
\(?\d{3}\)?[\.\s/-]\d{3}[\.-]\d{4}
10
([A-Z]\w+-)?([A-Z]\w+)(,\s)([A-Z]([\{\\"u\}]+)?(\w+)?[']?)(\s?[A-Z](\w+)?)?
11
((i.+\s<s.+)?((\s?<s\w+|<a)((\s[chs]\w+="(e|m|c|h\w+://((d\.)|w|v|t))|>)).+)(([gna]>)\s?)(.+o)?|(Con\w+)|(Str\w+))
12
((?<=\.\s)\w+\,\s([A-Z]\.)+)