Regex: Difference between revisions
→Examples
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=Examples=
1. To Match upto 999.999.999.999:
\b\d{1,3}\.\d{1,3}\.\d{1,3}\.\d{1,3}\b
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\b(?:(?:25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?)\.){3}(?:25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?)\b
1. Visa card numbers start with a 4. New cards have 16 digits. Old cards have 13:
^4[0-9]{12}(?:[0-9]{3})?$
2. MasterCard numbers start with the numbers 51 through 55. All have 16 digits:
^5[1-5][0-9]{14}$
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