Regular Expressions 101

^start of line

Group 1([^,]*,(\d\d)_[^,]*,[^,]*)

Negated Character Class[^,]*

*matches any number of characters outside the set below:

,the literal , (44₁₀ / 54₈ / 2C₁₆)

Group 2(\d\d)

\da digit

_the literal _ (95₁₀ / 137₈ / 5F₁₆)

Negated Character Class[^,]*

*matches any number of characters outside the set below:

,the literal , (44₁₀ / 54₈ / 2C₁₆)

Negated Character Class[^,]*

*matches any number of characters outside the set below:

,the literal , (44₁₀ / 54₈ / 2C₁₆)

Negative Lookbehind(?<!_\d\d)

_the literal _ (95₁₀ / 137₈ / 5F₁₆)

\da digit

,the literal , (44₁₀ / 54₈ / 2C₁₆)

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

s modifier: single line. Allows a dot to match line terminators

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25 tokens

Regular Expression

^([^,]*,(\d\d)_[^,]*,[^,]*)(?<!_\d\d),

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