regex101: credit card

^start of line

Non-Capturing Group(?:4[0-9]{12}(?:[0-9]{3})?|5[1-5][0-9]{14}|3[47][0-9]{13}|3(?:0[0-5]|[68][0-9])[0-9]{11}|6(?:011|5[0-9]{2})[0-9]{12}|(?:2131|1800|35\d{3})\d{11})

1st Alternative4[0-9]{12}(?:[0-9]{3})?

4the literal 4 (52₁₀ / 64₈ / 34₁₆)

Character Class[0-9]{12}

{12}matches exactly 12 characters from the set below:

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

Non-Capturing Group(?:[0-9]{3})?

?repeats the group contents below at most once:

Character Class[0-9]{3}

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

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

2nd Alternative5[1-5][0-9]{14}

5the literal 5 (53₁₀ / 65₈ / 35₁₆)

Character Class[1-5]

1-5one character from 1 (49₁₀) to 5 (53₁₀)

Character Class[0-9]{14}

{14}matches exactly 14 characters from the set below:

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

3rd Alternative3[47][0-9]{13}

3the literal 3 (51₁₀ / 63₈ / 33₁₆)

Character Class[47]

4the literal 4 (52₁₀ / 64₈ / 34₁₆)

7the literal 7 (55₁₀ / 67₈ / 37₁₆)

Character Class[0-9]{13}

{13}matches exactly 13 characters from the set below:

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

4th Alternative3(?:0[0-5]|[68][0-9])[0-9]{11}

3the literal 3 (51₁₀ / 63₈ / 33₁₆)

Non-Capturing Group(?:0[0-5]|[68][0-9])

1st Alternative0[0-5]

0the literal 0 (48₁₀ / 60₈ / 30₁₆)

Character Class[0-5]

0-5one character from 0 (48₁₀) to 5 (53₁₀)

2nd Alternative[68][0-9]

Character Class[68]

6the literal 6 (54₁₀ / 66₈ / 36₁₆)

8the literal 8 (56₁₀ / 70₈ / 38₁₆)

Character Class[0-9]

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

Character Class[0-9]{11}

{11}matches exactly 11 characters from the set below:

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

5th Alternative6(?:011|5[0-9]{2})[0-9]{12}

6the literal 6 (54₁₀ / 66₈ / 36₁₆)

Non-Capturing Group(?:011|5[0-9]{2})

1st Alternative011

011the literal text 011

2nd Alternative5[0-9]{2}

5the literal 5 (53₁₀ / 65₈ / 35₁₆)

Character Class[0-9]{2}

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

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

Character Class[0-9]{12}

{12}matches exactly 12 characters from the set below:

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

6th Alternative(?:2131|1800|35\d{3})\d{11}

$end of line

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

Search reference

Regular Expression

^(?:4[0-9]{12}(?:[0-9]{3})?|5[1-5][0-9]{14}|3[47][0-9]{13}|3(?:0[0-5]|[68][0-9])[0-9]{11}|6(?:011|5[0-9]{2})[0-9]{12}|(?:2131|1800|35\d{3})\d{11})$

Unit Tests

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