Regular Expressions 101

Definition Group(?(DEFINE) (?<sep> [ -]?) )

Group sep(?<sep> [ -]?)

Character Class[ -]?

?matches at most one character from the set below:

the literal (32₁₀ / 40₈ / 20₁₆)

-the literal - (45₁₀ / 55₈ / 2D₁₆)

Negative Lookbehind(?<!\d)

\da digit

Non-Capturing Group(?: \d{4} (?&sep) \d{4} (?&sep) \d{4} (?&sep) \d{4} # 16 digits | \d{3} (?&sep) \d{3} (?&sep) \d{3} (?&sep) \d (?&sep) \d{3} # 13 digits | \d{4} (?&sep) \d{6} (?&sep) \d{4} # 14 digits | \d{4} (?&sep) \d{6} (?&sep) \d{5} # 15 digit card )

1st Alternative \d{4} (?&sep) \d{4} (?&sep) \d{4} (?&sep) \d{4} # 16 digits

\d{4}a digit, repeated exactly 4 times

(?&sep)calls group sep as a subroutine

\d{4}a digit, repeated exactly 4 times

(?&sep)calls group sep as a subroutine

\d{4}a digit, repeated exactly 4 times

(?&sep)calls group sep as a subroutine

\d{4}a digit, repeated exactly 4 times

Comment: 16 digits

2nd Alternative \d{3} (?&sep) \d{3} (?&sep) \d{3} (?&sep) \d (?&sep) \d{3} # 13 digits

\d{3}a digit, repeated exactly 3 times

(?&sep)calls group sep as a subroutine

\d{3}a digit, repeated exactly 3 times

(?&sep)calls group sep as a subroutine

\d{3}a digit, repeated exactly 3 times

(?&sep)calls group sep as a subroutine

\da digit

(?&sep)calls group sep as a subroutine

\d{3}a digit, repeated exactly 3 times

Comment: 13 digits

3rd Alternative \d{4} (?&sep) \d{6} (?&sep) \d{4} # 14 digits

\d{4}a digit, repeated exactly 4 times

(?&sep)calls group sep as a subroutine

\d{6}a digit, repeated exactly 6 times

(?&sep)calls group sep as a subroutine

\d{4}a digit, repeated exactly 4 times

Comment: 14 digits

4th Alternative \d{4} (?&sep) \d{6} (?&sep) \d{5} # 15 digit card

\d{4}a digit, repeated exactly 4 times

(?&sep)calls group sep as a subroutine

\d{6}a digit, repeated exactly 6 times

(?&sep)calls group sep as a subroutine

\d{5}a digit, repeated exactly 5 times

Comment: 15 digit card

Negative Lookahead(?!\d)

\da digit

Global pattern flags

g modifier: global. Finds all matches instead of stopping after the first

x modifier: extended. Ignores unescaped whitespace and comments outside character classes

Detailed match information will be displayed here automatically.

Search reference

Regular Expression

                (?(DEFINE)
                    (?<sep> [ -]?)
                )
                (?<!\d)(?:
                  \d{4} (?&sep) \d{4} (?&sep) \d{4} (?&sep) \d{4}               # 16 digits
                | \d{3} (?&sep) \d{3} (?&sep) \d{3} (?&sep) \d (?&sep) \d{3}    # 13 digits
                | \d{4} (?&sep) \d{6} (?&sep) \d{4}                             # 14 digits
                | \d{4} (?&sep) \d{6} (?&sep) \d{5}                             # 15 digit card
                )(?!\d)

New

4111111111111111
4111 1111 1111 1111
4111-1111-1111-1111

American Express

378282246310005

American Express

371449635398431

American Express Corporate

378734493671000

Australian BankCard

5610591081018250

Diners Club

30569309025904

Diners Club

38520000023237

Discover

6011111111111117

Discover

6011000990139424

JCB

3530111333300000

JCB

3566002020360505

MasterCard

5555555555554444

MasterCard

5105105105105100

Visa

4111111111111111

Visa

4012888888881881

Visa

4222222222222

Note : Even though this number has a different character count than the other test numbers, it is the correct and functional number.

Processor-specific Cards

Dankort (PBS)

76009244561

Dankort (PBS)

5019717010103742

Switch/Solo (Paymentech)

6331101999990016

 Visa

4929208147724685
4539261278252432
4916790209546242
4556229836495866
4556624948936262
 Mastercard

5527513721190671
5427136938547169
5501820872619287
5106667846492187
5348965176175440
 Discover

6011692621234093
6011505674384294
6011686367026051
6011805238158246
6011056229327552
 American Express

370831029267044
345838860105292
346823285239073
370750517718351
340533441239380



PHONE NUMBERS:

Local (Canada)
613-555-0104
613-555-0141
613-555-0159
613-555-0130
613-555-0163
613-555-0137
International (Canada)
+1-613-555-0104
+1-613-555-0141
+1-613-555-0159
+1-613-555-0130
+1-613-555-0163
+1-613-555-0137

Substitution