Examples of common regular expressions

This article summarises some of the most common regular expressions in the configuration for document extraction or sorting.

These expressions can also be used as a pattern for field validation (HTML5 pattern).

Text with three numbers, one capital letter and eight numbers.

For example: 050A94834844

The expression would be: [0-9]{3}[A-Z]{1}[0-9]{8}

DNI

For example: 76545467K

The expression would be: [0-9]{8}[A-Z]{1}

Useful links

Tool for testing online expressions (remember not to put sensitive data in this tool): https://pythex.org/

Other employers: https://www.html5pattern.com/