Regular Expressions 101

Explanation
Pro

Non-Capturing Group(?:<a\s+(?:[^>]*)?href="|(?!^)\G)

1st Alternative<a\s+(?:[^>]*)?href="

<athe literal text <a (case insensitive)

\s+any whitespace character, repeated at least once

Non-Capturing Group(?:[^>]*)?

?repeats the group contents below at most once:

Negated Character Class[^>]*

*matches any number of characters outside the set below:

>the literal > (62₁₀ / 76₈ / 3E₁₆)

href="the literal text href=" (case insensitive)

2nd Alternative(?!^)\G

Negative Lookahead(?!^)

^start of string

\Gstart of current search

\Kresets the starting point of the reported match. Any previously consumed characters are no longer included in the final match

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

Group 1([A-Z]?\d{5})

Character Class[A-Z]?

?matches at most one character from the set below:

A-Zone character from A (65₁₀) to Z (90₁₀) (case insensitive)

\d{5}a digit, repeated exactly 5 times

Positive Lookahead(?=.*?")

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

"the literal " (34₁₀ / 42₈ / 22₁₆)

Global pattern flags

g modifier: global. Finds all matches instead of stopping after the first

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

Match Information

Detailed match information will be displayed here automatically.

Quick Reference

25 tokens

Regular Expression

(?:<a\s+(?:[^>]*)?href="|(?!^)\G)\K.*?([A-Z]?\d{5})(?=.*?")

New

<a href="/uploads/2014/04/Draft-99990-Details.doc">Draft 99995 Details</a>
<a href="/uploads/2014/04/01090-vs-G01010-series.pdf">01095 vs G01015 Series</a>

Substitution

<a href="/uploads/2014/04/Draft-99990-Details.doc">Draft 99995 Details</a>
<a href="/uploads/2014/04/01090-vs-G01010-series.pdf">01095 vs G01015 Series</a>