regex101: Credit Cards

Pro

1st Alternative(^4[0-9]{12}(?:[0-9]{3})?$)

Group 1(^4[0-9]{12}(?:[0-9]{3})?$)

^start of string

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)

$end of string, or before its final line terminator

2nd Alternative(^(?:5[1-5][0-9]{2}|222[19]|22[39][0-9]|2[3-6][0-9]{2}|27[01][0-9]|2720)[0-9]{12}$)

Group 2(^(?:5[1-5][0-9]{2}|222[19]|22[39][0-9]|2[3-6][0-9]{2}|27[01][0-9]|2720)[0-9]{12}$)

^start of string

Non-Capturing Group(?:5[1-5][0-9]{2}|222[19]|22[39][0-9]|2[3-6][0-9]{2}|27[01][0-9]|2720)

1st Alternative5[1-5][0-9]{2}

5the literal 5 (53₁₀ / 65₈ / 35₁₆)

Character Class[1-5]

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

Character Class[0-9]{2}

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

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

2nd Alternative222[19]

222the literal text 222

Character Class[19]

1the literal 1 (49₁₀ / 61₈ / 31₁₆)

9the literal 9 (57₁₀ / 71₈ / 39₁₆)

3rd Alternative22[39][0-9]

22the literal text 22

Character Class[39]

3the literal 3 (51₁₀ / 63₈ / 33₁₆)

9the literal 9 (57₁₀ / 71₈ / 39₁₆)

Character Class[0-9]

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

4th Alternative2[3-6][0-9]{2}

2the literal 2 (50₁₀ / 62₈ / 32₁₆)

Character Class[3-6]

3-6one character from 3 (51₁₀) to 6 (54₁₀)

Character Class[0-9]{2}

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

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

5th Alternative27[01][0-9]

27the literal text 27

Character Class[01]

0the literal 0 (48₁₀ / 60₈ / 30₁₆)

1the literal 1 (49₁₀ / 61₈ / 31₁₆)

Character Class[0-9]

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

6th Alternative2720

2720the literal text 2720

Character Class[0-9]{12}

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

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

$end of string, or before its final line terminator

3rd Alternative(^3[47][0-9]{13})

Group 3(^3[47][0-9]{13})

4th Alternative(^3(?:0[0-5]|[68][0-9])[0-9]{11}$)

5th Alternative(^6(?:011|5[0-9]{2})[0-9]{12}$)

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

25 tokens

Regular Expression

(^4[0-9]{12}(?:[0-9]{3})?$)|(^(?:5[1-5][0-9]{2}|222[19]|22[39][0-9]|2[3-6][0-9]{2}|27[01][0-9]|2720)[0-9]{12}$)|(^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|35d{3})d{11}$)

Unit Tests

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