disallow input of certain characters in a field
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Hello,
I have a field that is used as a filename. What I like to do is that a user only can type characters that are permitted in a filename for unix, mac, linux.
What’s the best method to do this? Can you advice?
Thank you, Wilfried
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Hello @wilfried1954
If you are using a “Single Line Text” field, you should to enter the regular expression to use for validation into the “Validate against a regular expression” attribute, and the error text to display if the validation fails into the attribute: “Error message when the regular expression fails”
In the following screenshot the regular expression validate the field’s values be digits only:
Best regards.
Thank you!
Possible it benefit for others. So I put my solution here. This is the Regular expression needed for filenames in Windows. I still have to expand it a little for Linux, but as the limits are the most big for Windows, this should do at least for Windows users:
^(?!^(PRN|AUX|CLOCK\$|NUL|CON|COM\d|LPT\d|\..*)(\..+)?$)[^\x00-\x1f\\?*:\";|/]+$Best regards, Wilfried
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