regex101: Python Match Workspace

\ba Unicode word boundary

ankit_bill_20the literal text ankit_bill_20 (case sensitive)

Character Class[0-9]

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

Character Class[0-9]

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

-the literal - (45₁₀ / 55₈ / 2D₁₆)

Non-Capturing Group(?:[1-9]|1[0-2]|0[0-9])

1st Alternative[1-9]

Character Class[1-9]

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

2nd Alternative1[0-2]

1the literal 1 (49₁₀ / 61₈ / 31₁₆)

Character Class[0-2]

0-2one character from 0 (48₁₀) to 2 (50₁₀)

3rd Alternative0[0-9]

0the literal 0 (48₁₀ / 60₈ / 30₁₆)

Character Class[0-9]

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

-the literal - (45₁₀ / 55₈ / 2D₁₆)

Non-Capturing Group(?:[1-9]|1[0-9]|2[0-9]|3[0-1]|0[0-9])

1st Alternative[1-9]

Character Class[1-9]

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

2nd Alternative1[0-9]

1the literal 1 (49₁₀ / 61₈ / 31₁₆)

Character Class[0-9]

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

3rd Alternative2[0-9]

2the literal 2 (50₁₀ / 62₈ / 32₁₆)

Character Class[0-9]

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

4th Alternative3[0-1]

3the literal 3 (51₁₀ / 63₈ / 33₁₆)

Character Class[0-1]

0-1one character from 0 (48₁₀) to 1 (49₁₀)

5th Alternative0[0-9]

0the literal 0 (48₁₀ / 60₈ / 30₁₆)

Character Class[0-9]

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

-the literal - (45₁₀ / 55₈ / 2D₁₆)

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 _ (95₁₀ / 137₈ / 5F₁₆)

Non-Capturing Group(?:abc|cde)

1st Alternativeabc

abcthe literal text abc (case sensitive)

2nd Alternativecde

cdethe literal text cde (case sensitive)

Character Class[0-6]{0,2}

{0,2}matches between 0 and 2 characters from the set below:

0-6one character from 0 (48₁₀) to 6 (54₁₀)

\.the literal . (46₁₀ / 56₈ / 2E₁₆)

csvthe literal text csv (case sensitive)

\ba Unicode word boundary

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

25 tokens

Regular Expression

\bankit_bill_20[0-9][0-9]-(?:[1-9]|1[0-2]|0[0-9])-(?:[1-9]|1[0-9]|2[0-9]|3[0-1]|0[0-9])-[0-9]{2}_(?:abc|cde)[0-6]{0,2}\.csv\b

New

ankit_bill_2019-12-02-00_abc01.csv
ankit_bill_2019-12-02-00_abc.csv

Substitution

ankit_bill_2019-12-02-00_abc01.csv
ankit_bill_2019-12-02-00_abc.csv