Regular Expressions 101

<secondary_references>the literal text <secondary_references> (case sensitive)

Group 1(\[id=(\d+)\]([-, ]{0,2}))*

*repeats the group contents below any number of times:

\[the literal [ (91₁₀ / 133₈ / 5B₁₆)

id=the literal text id= (case sensitive)

Group 2(\d+)

\d+a Unicode decimal digit, repeated at least once

\]the literal ] (93₁₀ / 135₈ / 5D₁₆)

Group 3([-, ]{0,2})

Character Class[-, ]{0,2}

{0,2}matches between 0 and 2 characters from the set below:

-the literal - (45₁₀ / 55₈ / 2D₁₆)

,the literal , (44₁₀ / 54₈ / 2C₁₆)

the literal (32₁₀ / 40₈ / 20₁₆)

</secondary_references>the literal text </secondary_references> (case sensitive)

Global pattern flags

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

u modifier: unicode. Makes \w, \W, \b, \B, \d, \D, \s, and \S use Unicode semantics (redundant in Python 3)

Detailed match information will be displayed here automatically.

Search reference

Regular Expression

<secondary_references>(\[id=(\d+)\]([-, ]{0,2}))*</secondary_references>

New

<secondary_references>[id=1],[id=2]</secondary_references>
<secondary_references>[id=1]</secondary_references>
<secondary_references>[id=1]-[id=2]</secondary_references>
<secondary_references>[id=1][id=2]</secondary_references>

Substitution

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