# Expression Editor

**URL:** <https://forum.inductiveautomation.com/t/expression-editor/102652>\
**Category:** Ignition\
**Tags:** ignition81\
**Created:** [February 20, 2025, 7:30pm UTC](https://forum.inductiveautomation.com/t/expression-editor/102652 "2025-02-20T19:30:35Z")\
**Posts on this page:** 3\
**Page:** 1

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**Author:** ![Zachary\_Sobie](https://avatars.discourse-cdn.com/v4/letter/z/ad7895/32.png) [@Zachary\_Sobie](https://forum.inductiveautomation.com/u/Zachary_Sobie)\
**Post date:** [February 20, 2025, 7:30pm UTC](https://forum.inductiveautomation.com/t/expression-editor/102652/1 "2025-02-20T19:30:35Z")

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![image](https://us1.discourse-cdn.com/inductiveautomation/original/3X/5/a/5a48c061136e548549f80555ff11d3fbd63dc021.png)

I am attempting to add a Scrubber System to an existing Ignition project. I am using the same screen, but changing the tag values based on the site location.

The previous Engineer some how used a [.] to represent the tag path in the Expression Editor? I need to add the same tags, but change the path. How can I change the value of the [.]?

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**Author:** ![ryan.white](https://sea1.discourse-cdn.com/inductiveautomation/user_avatar/forum.inductiveautomation.com/ryan.white/32/73193_2.png) [@ryan.white](https://forum.inductiveautomation.com/u/ryan.white)\
**Post date:** [February 20, 2025, 7:55pm UTC](https://forum.inductiveautomation.com/t/expression-editor/102652/2 "2025-02-20T19:55:12Z")

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From the docs, at least when used on a tag:

> `[.]` Relative to the folder of the Tag that is being bound. This is especially useful in UDT definitions.

> **[Tag Paths | Ignition User Manual](https://www.docs.inductiveautomation.com/docs/8.1/platform/tags/tag-paths#using-relative-tag-paths)**
>
> Tags and their properties can be referenced by a string-based path in many areas of Ignition, such as expressions and scripts. Each Tag has a unique absolute path and often has many equivalent relative paths when referenced from other Tags. In most...

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**Author:** ![nminchin](https://sea1.discourse-cdn.com/inductiveautomation/user_avatar/forum.inductiveautomation.com/nminchin/32/6911_2.png) [@nminchin](https://forum.inductiveautomation.com/u/nminchin)\
**Post date:** [February 21, 2025, 12:16am UTC](https://forum.inductiveautomation.com/t/expression-editor/102652/3 "2025-02-21T00:16:33Z")

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I'd expect that all they did was to use the tag selector to choose the tags, and it added in the relative tag reference automatically