regex for windows path

Question

As part of fortify fix we need to validate a filepath. For example,

1. "C:/Users/<username>/sample1.txt"
2. "C:\Users\<username>\sample1.txt"

We have tried with the below regex for validating the above paths but we ended up with error when a filepath contains \. So please suggest the valid regex which can accept both the slashes in a filepath.

Validator.FilePath=.*[\\]\\[!"#$%&'()_*+,/:;<=>?@\\^`{|}~].*

Answer 1

You can try:

[a-zA-Z]:[\\\/](?:[a-zA-Z0-9]+[\\\/])*([a-zA-Z0-9]+\.txt)

• [a-zA-Z]: is for the drive letter and :.
• [\\\/] to match either \ or /.
• (?:[a-zA-Z0-9]+[\\\/])* is for folder names. You can add any charcters in the character class that you may need. I used only a-zA-Z0-9.
• ([a-zA-Z0-9]+\.txt) is for the file name and .txt extension - it matches the file name, with the extension, and captures it.