https://community.appian.com/discussions/f/general/17719/validate-alphanumeric-characters-in-an-input-fieldHi I am working in version 19.3. I have two requirements: 1. In a text field, user is able to enter only alphanumeric characters and no special characters. For eg: User can enter the values- 1235678901, 12A3178R9, 12ru38901, u189132W9 en-USTelligent Community 12https://community.appian.com/thread/69763?ContentTypeID=1Mon, 07 Oct 2019 11:19:39 GMTd3a83456-d57b-489c-a84c-4e8267bb592a:bb91a17c-6fa8-41a5-a28c-5a4902f092fbStewart Burchell<p>I second&nbsp;<span>Bhanu - Regex is definitely the way&nbsp;to go. With the right pattern it will provide the precise validation you&#39;re after with&nbsp;minimal effort.</span></p><div style="clear:both;"></div>https://community.appian.com/thread/69760?ContentTypeID=1Mon, 07 Oct 2019 08:41:26 GMTd3a83456-d57b-489c-a84c-4e8267bb592a:af196617-dbb7-49e3-973a-ff80fb32c602bhanuprakash1303<p>Hi Komalc,</p> <p>In apian&nbsp; have regex function for doing this kind of validation please use this. Before use that function you have to install regex plugin</p> <p>Hope it will help to you</p> <p>Regards,</p> <p>Bhanu Prakash.</p><div style="clear:both;"></div>