Regular Expression Validator
As a developer, you may need an access to the "test" credit card numbers from various brands. We are listing a commonly used credit
card numbers from well known brands that you can utilize. The numbers below conforms to Luhn check, and are valid card numbers.
What is the regular expression?
A regular expression is a pattern used in a scripting languages such as the Sed, Awk, PHP, Perl, Bash and other programming languages to match subject string. It is used to search a string (or text) to match all occurances of a pattern, and allows it to act on it (i.e. replace with another string).
Patterns
A regular expression uses a pattern to match a string. There are literal characters which matches exact character, and wildcard characters that matches a variety of characters. Also, there are symbols that match number of occurances (?, + and *). To give you a flavor of how regular expression works, here are some concepts used to match a text.
| Meta Character |
Operation |
Example |
Description |
| | |
Or |
apple|orange|pear |
Matches apple, orange, or pear |
| () |
Group |
gr(a|e)y |
Matches grey or gray |
| . |
Any char |
a.c |
Matches abc, adc, aMc |
| ? |
0 or 1 occurance |
colou?r |
Matches color or colour |
| * |
0 or more occurance |
xyz* |
Matches xy, xyz, xyzz |
| + |
1 or more occurance |
xyz+ |
Matches xyz, xyzz, xyzzz |
| - |
Range with bracket |
[a-z] |
Matches a, b, through z |
| [] |
Or 1 character |
[abc] |
Matches a, b or c |
| [^ ] |
Not contained |
[abc] |
Matches any char but a, b or c |
| ^ |
Beginning of string |
^abc |
Matches starting with abc |
| $ |
End of string |
xyz$ |
Matches string ending xyz |
| \t |
Tab |
\t |
Matches tab |
| \n |
New Line |
\n |
Matches new line |
| \n, n=1..9 |
Match nth item |
(abc|xyz)\1 |
Matches abcabc, abcxyz |
| {n}, n=1..9 |
match n times |
a{3} |
Matches aaa |
