Regular Expressions 101

1st Alternative(?<= )(?=.{0,3}[A-Z])[A-Z\d]{2,4}\d{4,8}(?= )

Positive Lookbehind(?<= )

the literal (32₁₀ / 40₈ / 20₁₆)

Positive Lookahead(?=.{0,3}[A-Z])

.{0,3}any character (except for line terminators), repeated between 0 and 3 times

Character Class[A-Z]

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

Character Class[A-Z\d]{2,4}

{2,4}matches between 2 and 4 characters from the set below:

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

\da digit

\d{4,8}a digit, repeated between 4 and 8 times

Positive Lookahead(?= )

the literal (32₁₀ / 40₈ / 20₁₆)

2nd Alternative(?<=\t).*?(?=\t)

Positive Lookbehind(?<=\t)

\ta tab character (ASCII 9)

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

Positive Lookahead(?=\t)

\ta tab character (ASCII 9)

Global pattern flags

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

m modifier: multiline. Causes ^ and $ to match the start and end of each line, not only the start and end of the string

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25 tokens

Regular Expression

(?<= )(?=.{0,3}[A-Z])[A-Z\d]{2,4}\d{4,8}(?= )|(?<=\t).*?(?=\t)

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