Regular Expressions 101

Positive Lookbehind(?<==)

=the literal = (61₁₀ / 75₈ / 3D₁₆)

.*?any character (except for line terminators), repeated any number of times

Positive Lookahead(?=&)

&the literal & (38₁₀ / 46₈ / 26₁₆)

Detailed match information will be displayed here automatically.

Search reference

Regular Expression

(?<==).*?(?=&)

New

https://www.google.com/url?q=http://www.site.net/file.doc&sa=U&ei=_YeOUc&ved=0CB&usg=AFQjCN-5OX