Pattern: Credit card number

“Credit card number” is one of the patterns that you can select on the Match panel. Use this pattern to match a series of digits that looks like a credit card number from one or more of the world’s major credit card issuers.

This example shows how you can use the “credit card” pattern to look for credit card numbers. You can find this example as “Pattern: credit card number” in the RegexMagic library.

  1. Click the New Formula button on the top toolbar to clear out all settings on the Samples, Match, and Action panels.
  2. On the Samples panel, paste in one new sample that has a block of valid card numbers and a block of invalid card numbers for each of the major credit card brands: 
    Visa
4123456789012
4123456789012345

412345678901
41234567890123
412345678901234
41234567890123456

MasterCard
5123456789012345

512345678901234
51234567890123455

Discover
6011123456789012
6512345678901234

601112345678901
60111234567890123

American Express
341234567890123
371234567890123

34123456789012
301234567890123
3712345678901234

Diner's Club
30012345678901
30512345678901
36012345678901
36912345678901
38012345678901
38912345678901

30612345678901
37012345678901

JCB
213112345678901
180012345678901
3512345678901234

21311234567890
18001234567890
2131123456789012
1800123456789012
35123456789012

Random
123456789012345
  3. On the Match panel, click the Add First Field button to add field 1.
  4. In the “pattern to match field” drop-down list, select “credit card number”.



  5. Tick all the checkboxes for the credit card brands.
  6. Set the “field validation mode” to “average”.
  7. On the Regex panel, select “C# (.NET 2.0–8.0)” as your application, turn off free-spacing, and turn off mode modifiers. Click the Generate button, and you’ll get this regular expression: 
    \b(?:4[0-9]{12}(?:[0-9]{3})?|(?:5[1-5][0-9]{2}|2720|27[01][0-9]|2[3-6][0-9]{2}|22[3-9][0-9]|222[1-9])[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|35[0-9]{3})[0-9]{11})\b

    Unused options: Case sensitive; Exact spacing; Dot doesn’t match line breaks; ^$ don’t match at line breaks; Numbered capture.

  8. The Samples panel now highlights the valid credit card numbers matched by our regular expression: 
    Visa
4123456789012
4123456789012345

412345678901
41234567890123
412345678901234
41234567890123456

MasterCard
5123456789012345

512345678901234
51234567890123455

Discover
6011123456789012
6512345678901234

601112345678901
60111234567890123

American Express
341234567890123
371234567890123

34123456789012
301234567890123
3712345678901234

Diner's Club
30012345678901
30512345678901
36012345678901
36912345678901
38012345678901
38912345678901

30612345678901
37012345678901

JCB
213112345678901
180012345678901
3512345678901234

21311234567890
18001234567890
2131123456789012
1800123456789012
35123456789012

Random
123456789012345

Reference