Regular Expressions 101

Explanation
Pro

doithe literal text doi (case insensitive)

.+any Unicode character (except for line terminators), repeated at least once

Group 1(10\.\d{4,6}\/[^\"'&<% \t\n\r\f\v]+)

10the literal text 10

\.the literal . (46₁₀ / 56₈ / 2E₁₆)

\d{4,6}a Unicode decimal digit, repeated between 4 and 6 times

\/the literal / (47₁₀ / 57₈ / 2F₁₆)

Negated Character Class[^\"'&<% \t\n\r\f\v]+

+matches at least one character outside the set below:

\"the literal " (34₁₀ / 42₈ / 22₁₆)

'the literal ' (39₁₀ / 47₈ / 27₁₆)

&the literal & (38₁₀ / 46₈ / 26₁₆)

<the literal < (60₁₀ / 74₈ / 3C₁₆)

%the literal % (37₁₀ / 45₈ / 25₁₆)

the literal (32₁₀ / 40₈ / 20₁₆)

\ta tab character (ASCII 9)

\na line-feed (newline) character (ASCII 10)

\ra carriage return (ASCII 13)

\fa form-feed character (ASCII 12)

\va vertical tab character (ASCII 11)

Global pattern flags

i modifier: insensitive. Matches without distinguishing uppercase and lowercase letters

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25 tokens

doi.+(10\.\d{4,6}\/[^\"'&<% \t\n\r\f\v]+)

There are no unit tests.