Regular Expressions 101

%the literal % (37₁₀ / 45₈ / 25₁₆)

Group flag(?P<flag>\#|\+|\-| |0)?

?repeats the group contents below at most once:

1st Alternative\#

\#the literal # (35₁₀ / 43₈ / 23₁₆)

2nd Alternative\+

\+the literal + (43₁₀ / 53₈ / 2B₁₆)

3rd Alternative\-

\-the literal - (45₁₀ / 55₈ / 2D₁₆)

4th Alternative

the literal (32₁₀ / 40₈ / 20₁₆)

5th Alternative0

0the literal 0 (48₁₀ / 60₈ / 30₁₆)

Group 2((?P<width>[1-9])\.(?P<precision>[1-9])|(?P<widthDefaultPrecision>[1-9])|(?P<widthZeroPrecison>[1-9])\.|\.(?P<precisionDefaultWidth>[1-9]))?

?repeats the group contents below at most once:

1st Alternative(?P<width>[1-9])\.(?P<precision>[1-9])

Group width(?P<width>[1-9])

Character Class[1-9]

1-9one character from 1 (49₁₀) to 9 (57₁₀)

\.the literal . (46₁₀ / 56₈ / 2E₁₆)

Group precision(?P<precision>[1-9])

Character Class[1-9]

1-9one character from 1 (49₁₀) to 9 (57₁₀)

2nd Alternative(?P<widthDefaultPrecision>[1-9])

Group widthDefaultPrecision(?P<widthDefaultPrecision>[1-9])

Character Class[1-9]

1-9one character from 1 (49₁₀) to 9 (57₁₀)

3rd Alternative(?P<widthZeroPrecison>[1-9])\.

Group widthZeroPrecison(?P<widthZeroPrecison>[1-9])

Character Class[1-9]

1-9one character from 1 (49₁₀) to 9 (57₁₀)

\.the literal . (46₁₀ / 56₈ / 2E₁₆)

4th Alternative\.(?P<precisionDefaultWidth>[1-9])

\.the literal . (46₁₀ / 56₈ / 2E₁₆)

Group precisionDefaultWidth(?P<precisionDefaultWidth>[1-9])

Character Class[1-9]

1-9one character from 1 (49₁₀) to 9 (57₁₀)

Group verb(?P<verb>\w{1,9})

\w{1,9}any word character, repeated between 1 and 9 times

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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Search reference

Regular Expression

%(?P<flag>\#|\+|\-| |0)?((?P<width>[1-9])\.(?P<precision>[1-9])|(?P<widthDefaultPrecision>[1-9])|(?P<widthZeroPrecison>[1-9])\.|\.(?P<precisionDefaultWidth>[1-9]))?(?P<verb>\w{1,9})

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