Regex pattern that would validate numbers followed by letters and then numbers

@AgaB - 

Your regular expression is almost correct, but there's a small mistake in it. Instead of using (\s) to match spaces between digits and letters, you should use \s* to match zero or more spaces. Also, you can simplify it a bit. Here's the corrected version:

regex

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^([0-9]{9})\s*([A-Za-z]{2})\s*([0-9]{4})$

In this expression:

• ^ asserts the start of the string.
• ([0-9]{9}) matches exactly 9 digits.
• \s* matches zero or more spaces.
• ([A-Za-z]{2}) matches exactly 2 letters, either uppercase or lowercase.
• \s* matches zero or more spaces.
• ([0-9]{4}) matches exactly 4 digits.
• $ asserts the end of the string.

This should match the pattern you described: 9 digits followed by 2 letters followed by 4 digits, with optional spaces in between.