In general, text questions in Presto are wide open: if you can type it, you can enter it.  Sometimes, though, you may wish to restrict the type, length or format of the answer to a text question.  This can be done in Presto with a regex (short for "regular expression"). Some examples of restrictions:

  • Between 8 and 20 characters, including letters or numbers
  • Exactly 10 characters, numbers only
  • At least 50 characters but not more than 500
  • Email address format (any characters followed by "@" followed by at least one character followed by "." followed by at least two characters).

If you'd like to add a regex to your survey, contact our support department ( and tell us:

  • Company name
  • Survey name
  • Question text
  • How you want it restricted