Regular Expressions 101

Pro

^start of line

Group reg(?P<reg>[a-z]{3})

Character Class[a-z]{3}

{3}matches exactly 3 characters from the set below:

a-zone character from a (97₁₀) to z (122₁₀) (case sensitive)

Group env(?P<env>\d)

\da Unicode decimal digit

Non-Capturing Group(?:(?=[a-z\d]{5})(?P<xcon>[a-z]\d))?

?repeats the group contents below at most once:

Positive Lookahead(?=[a-z\d]{5})

Character Class[a-z\d]{5}

{5}matches exactly 5 characters from the set below:

a-zone character from a (97₁₀) to z (122₁₀) (case sensitive)

\da Unicode decimal digit

Group xcon(?P<xcon>[a-z]\d)

Character Class[a-z]

a-zone character from a (97₁₀) to z (122₁₀) (case sensitive)

\da Unicode decimal digit

Group type(?P<type>[a-z]{2})

Character Class[a-z]{2}

{2}matches exactly 2 characters from the set below:

a-zone character from a (97₁₀) to z (122₁₀) (case sensitive)

Group nbr(?P<nbr>\d)

\da Unicode decimal digit

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

No unit tests · Add a test to get started

25 tokens

^(?P<reg>[a-z]{3})(?P<env>\d)(?:(?=[a-z\d]{5})(?P<xcon>[a-z]\d))?(?P<type>[a-z]{2})(?P<nbr>\d)

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