Some expressions do not match the preferred template. You will see the following message when customizing an expression.

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Example 1: All - Credit Card numbers
[^\w-.;&](\d{14,19}|\d{4}[-. ]\d{4}[-. ]\d{4}[-. ]\d{4}([-. ]\d{3})?|\d{4}[-. ]\d{6}[-. ]\d{4,5})[^\w-.;&]

Where:

• [ ] - a character set. Match any character that is on the set.
• [^] - negated set. Match any character that is not on the set.
  • [^\w-.;&] - a word and -.;& will not be included on matching
• \w - Word. Matches any word character
• [-.;&] - If enclosed on a character set will match the characters specifically.
  • [-.;&*$abcd123] - will match any of the specified characters inside the set.
• () - Capturing Group. Groups multiple tokens together.
• \d - Any Digit ranging from 0-9
• {} - Quantifier.
  • \d{4} match 4 of the preceding token (1234)
  • \d{5} match 5 of the preceding token (18909)
  • \d {4,5} match between 4 and 5 of the preceding token. (1234 or 12345)
• | - Alternation. Boolean OR
• \s - Whitespace.

Example 2: Australia - Tax File Number (TFN)
[^\w-.;&](\d{8,9})[^\w-.;&]

Where:

• [^\w-.;&] - a negated set. A word and characters -.;& will not be included in matching.
• (\d{8,9}) - 8 or 9-digit tax file number

Example 3: India - Permanent Account Number (PAN)
[^\w\-]([A-Z]{3}[CPHFATBLJG][A-Z]\d{4}[A-Z])[^\w\-]

Where:

• [A-Z]{3} - 3 characters ranging A-Z
• [CPHFATBLJG] - a character that is one of “CPHFATBLJG”
• [A-Z] - one character ranging from A-Z
• \d{4} - a 4-digit number from 0-9
• [A-Z] - one character from A-Z

Example 4: Customized values where keyword is not applicable.
([M][S][1][Y][Q][T][\d{0-9}][\d{0-9}][\d{0-9}][\d{0-9}][\d{0-9}][A-Z][A-Z][\d{0-9}])

Use case

• MS1YQT14000MB9
• MS1YQT14000MC4

Where:

• [M][S][1][Y][Q][T] - are specific permanent characters on a text.
• [\d{0-9}][\d{0-9}][\d{0-9}][\d{0-9}][\d{0-9}] - 4 digit numbers ranging from 0-9
• [A-Z][A-Z] - 2 characters ranging from A-Z
• [0-9] - one digit number