Prevent special characters in multi upload field

[Daniel R.]

Hello

For single upload fields I can check the file name for special characters, this works with the following validation formula:

not(matches(@filename, '[~"#%&*:<>?/\\{|}^$@!]'))

Now I want the same for multiupload fields. Does anyone have an idea?

Best regards,
Daniel

[Alessandro Vernet]

Hi Daniel,

Try the following:

    empty(_[matches(@filename, '[~"#%&*:<>?/\\{|}^$@!]')])

This may seem increasingly cryptic, but it's actually quite simple ;). When using a Multiple File Attachments control, each file is stored in a child element `<_>`. The expression above simply checks whether any file name contains any of the specified characters; and ensures that none do.

I hope this helps,

-Alex

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[Daniel R.]

Hello Alex,

Thank you very much, that works well. Perfect.

Best regards and a nice day,
Daniel

[Alessandro Vernet]

Excellent, Daniel. And thank you for the update.

-Alex

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