Prevent the user from submitting a form is the answer for one question includes certain characters?

[tomjdg]

Hi,

together with a friend made a form for my teachers to submit our tasks etc. A workflow we made in Power Automate will automatically move attached files to SharePoint and create a Planner task.

But if they included one of the following characters in the title of the task, the workflow can't create a folder in SharePoint.  / \ : * ? " < > |

So my question: Is there an option to prevent the user from submitting the form if they used one of these characters in the answer for one question?

Thanks in Advance :)

[#2 · Accepted solution]

Found a solution using Power Automate: https://powerusers.microsoft.com/t5/Building-Flows/Filter-certain-characters-out-of-a-Forms-answer/m...