# How to specify filter for not match in frontend-config.js?

**URL:** <https://forum.canton.network/t/how-to-specify-filter-for-not-match-in-frontend-config-js/1879>\
**Category:** App Development\
**Created:** [January 4, 2021, 1:53am UTC](https://forum.canton.network/t/how-to-specify-filter-for-not-match-in-frontend-config-js/1879 "2021-01-04T01:53:46Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![a14843](https://avatars.discourse-cdn.com/v4/letter/a/f07891/32.png) [@a14843](https://forum.canton.network/u/a14843)\
**Post date:** [January 4, 2021, 1:53am UTC](https://forum.canton.network/t/how-to-specify-filter-for-not-match-in-frontend-config-js/1879/1 "2021-01-04T01:53:46Z")

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I can display contracts that belong to a particular party using “filter” in customViews in frontend-config.js … but how about the opposite? I.e. to filter contracts that does **not** belong to that particular party?

May be a more generic question is, can I specify a regular expression for filter?

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**Author:** ![cocreature](https://yyz2.discourse-cdn.com/flex034/user_avatar/forum.canton.network/cocreature/32/36_2.png) [@cocreature](https://forum.canton.network/u/cocreature)\
**Post date:** [January 12, 2021, 5:56pm UTC](https://forum.canton.network/t/how-to-specify-filter-for-not-match-in-frontend-config-js/1879/2 "2021-01-12T17:56:54Z")

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Hi @a14843, sorry for the long delay. Navigator only supports substring matching on fields. There is no option to assert that a field is not equal to a specific value.