Regular Expressions 101

^start of line

vthe literal v (118₁₀ / 166₈ / 76₁₆) (case sensitive)

Group schema_version(?P<schema_version>[0-9]{2})

Character Class[0-9]{2}

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

0-9one character from 0 (48₁₀) to 9 (57₁₀)

_ the literal text _

Group datestamp(?P<datestamp>\d{4}-\d{2}-\d{2}_\d{2}\.\d{2}\.\d{2})

\d{4}a Unicode decimal digit, repeated exactly 4 times

-the literal - (45₁₀ / 55₈ / 2D₁₆)

\d{2}a Unicode decimal digit, repeated exactly 2 times

-the literal - (45₁₀ / 55₈ / 2D₁₆)

\d{2}a Unicode decimal digit, repeated exactly 2 times

_the literal _ (95₁₀ / 137₈ / 5F₁₆)

\d{2}a Unicode decimal digit, repeated exactly 2 times

\.the literal . (46₁₀ / 56₈ / 2E₁₆)

\d{2}a Unicode decimal digit, repeated exactly 2 times

\.the literal . (46₁₀ / 56₈ / 2E₁₆)

\d{2}a Unicode decimal digit, repeated exactly 2 times

_ the literal text _

Group metadata(?P<metadata>[0-9a-z]{40})

Character Class[0-9a-z]{40}

{40}matches exactly 40 characters from the set below:

0-9one character from 0 (48₁₀) to 9 (57₁₀)

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

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

x modifier: extended. Ignores unescaped whitespace and comments outside character classes

x

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Search reference

Regular Expression

^v(?P<schema_version>[0-9]{2})_
(?P<datestamp>\d{4}-\d{2}-\d{2}_\d{2}\.\d{2}\.\d{2})_
(?P<metadata>[0-9a-z]{40})

Unit Tests

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