# Special character check in visibility conditions **URL:** \ **Category:** Ask for Help\ **Created:** [December 23, 2023, 7:34am UTC](https://community.glideapps.com/t/special-character-check-in-visibility-conditions/68954 "2023-12-23T07:34:53Z")\ **Posts on this page:** 3\ **Page:** 1
**Author:** ![absolutenathan](https://sea2.discourse-cdn.com/flex002/user_avatar/community.glideapps.com/absolutenathan/32/61679_2.png) [@absolutenathan](https://community.glideapps.com/u/absolutenathan)\ **Post date:** [December 23, 2023, 7:34am UTC](https://community.glideapps.com/t/special-character-check-in-visibility-conditions/68954/1 "2023-12-23T07:34:53Z")
I’m making an app that uses a username system. The users can’t use any special characters with the exception of \_ or -. That includes spaces too. How would I be able to check that a user doesn’t have those on the “change username” screen to show the button to finalize their username? ---
**Author:** ![Uzo](https://sea2.discourse-cdn.com/flex002/user_avatar/community.glideapps.com/uzo/32/22639_2.png) [@Uzo](https://community.glideapps.com/u/Uzo)\ **Post date:** [December 23, 2023, 7:54am UTC](https://community.glideapps.com/t/special-character-check-in-visibility-conditions/68954/2 "2023-12-23T07:54:10Z")
Try this: ![Screenshot 2023-12-22 at 9.53.17 PM](https://us1.discourse-cdn.com/flex002/uploads/glideapps/original/3X/e/0/e0aef65542294fe84abc6274d7d3ef7826ce0dac.jpeg) ```auto var regex = /^[a-zA-Z0-9-_]+$/; return regex.test(p1); ``` ---
**Author:** ![system](https://sea2.discourse-cdn.com/flex002/user_avatar/community.glideapps.com/system/32/53398_2.png) [@system](https://community.glideapps.com/u/system)\ **Post date:** [January 5, 2024, 4:18pm UTC](https://community.glideapps.com/t/special-character-check-in-visibility-conditions/68954/3 "2024-01-05T16:18:40Z")
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