Update, clarify supported regex

models/app/features/panels/line-plot.mdx

@@ -53,13 +53,13 @@ In an [automatic workspace](/models/app/features/panels#workspace-modes), W&B cr
 
     To add a line plot directly to a section instead, click the section's **action (<Icon icon="ellipsis" iconType="solid"/>)** menu, then click **+ Add panels**.
 1. Click **Quick panel builder**, then click the **Multi-metric panels** tab.
-1. In **Regex** enter an expression in [JavaScript regular expression](https://www.w3schools.com/js/js_regexp.asp) format. As you type, the UI updates to show which metrics match the expression. By default, the plot name shows the regular expression used by the plot. The plot includes lines for all metrics that match the expression, including metrics logged in the future.
+1. In **Regex** enter an expression with [Google's RE2](https://github.com/google/re2/wiki/Syntax) format. As you type, the UI updates to show which metrics match the expression. By default, the plot name shows the regular expression used by the plot. The plot includes lines for all metrics that match the expression, including metrics logged in the future.
 1. To optionally remove duplicate single-metric panels when the multi-metric plot is created, toggle **Clean up auto-generated panels**. A preview shows which panels are cleaned up. <Note>When this option is turned on, W&B doesn't create a single-metric plot for a newly logged metric that matches the expression. Instead, it appears only in this multi-metric plot.</Note>
 1. Click **Create [NUMBER] panels**.
 
 ### Multi-metric regular expressions
 
-Multi-metric line plots use [JavaScript regular expressions](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Guide/Regular_expressions) to match metric names. The following sections describe common use cases and provide more details about how the regular expressions work, such as how capture groups affect the panels that W&B creates.
+Multi-metric line plots use [Google's RE2](https://github.com/google/re2/wiki/Syntax) syntax to match metric names. The following sections describe common use cases and provide more details about how the regular expressions work, such as how capture groups affect the panels that W&B creates.
 
 #### Common use cases
 

models/runs/search-runs.mdx

@@ -3,22 +3,17 @@ title: "Search runs"
 description: "Learn how to search for specific runs by name or ID in your project's Runs table or Workspace."
 ---
 
-Use the search box within your project's Runs table or Workspace to find specific [runs by name or ID](/models/runs/run-identifiers).
+Use the search box in your project's Runs table or Workspace to find specific [runs by name or ID](/models/runs/run-identifiers). W&B interprets search queries as regular expressions that use [Google RE2 syntax](https://github.com/google/re2/wiki/Syntax).
 
-<Note>
-By default, the search box uses regular expressions (RegEx) to match your query against run names or IDs.
-</Note>
-
-## Search for runs by name or ID
-1. Click either the **Runs** tab or **Workspace** from the project sidebar.
-2. Click on the search box at the top of the runs table.
-3. Enter the run name or run ID you want to search for.
+## Search for a run by name or ID
+1. From the project sidebar, select **Runs** or **Workspace**.
+2. Select the search box at the top of the runs table.
+3. Enter a run name, run ID, or regular expression that uses RE2 syntax.
 
 ## Turn off regular expressions search
 
-1. Click either the **Runs** tab or **Workspace** from the project sidebar.
-2. Click on the search box at the top of the runs table.
-3. Toggle off the **RegEx** toggle (.*) so that it is gray.
-
-
+To search for an exact text string instead of a regular expression:
 
+1. From the project sidebar, select **Runs** or **Workspace**.
+2. Select the search box at the top of the runs table.
+3. Turn off the RegEx toggle (`.*`). The toggle appears gray when regular expression search is disabled.

platform/hosting/monitoring-usage/mobile-app.mdx

@@ -50,7 +50,7 @@ The following features are available in the mobile app.
     - **Mobile-optimized panel grouping**: Panels are automatically grouped by name into collapsible sections. You can collapse the ungrouped metrics section to focus on named sections. Sections are a single level (not nested), and grouping follows the same rules as [workspace panels](/models/app/features/panels) in the W&B web app, so the layout stays consistent when you move between desktop and your phone.
     - **Star panels**: See your most important panels at a glance. When viewing a run or a project, click the star icon at the top of a panel to star it. To filter the list to only starred panels, click the **Starred** tab at the top of the list.
     - **Star metrics**: When viewing an important metric in detail view, click the star icon to star it.
-    - **Search panels**: When viewing a run or a project, use the **panel search** field at the bottom of the screen to filter which runs appear in each chart. You can search with [JavaScript regular expressions](https://www.w3schools.com/js/js_regexp.asp) to match patterns in run names.
+    - **Search panels**: When viewing a run or a project, use the **panel search** field at the bottom of the screen to filter which runs appear in each chart. You can search with [RE2 syntax](https://github.com/google/re2/wiki/Syntax) to match patterns in run names.
     - **Chart tooltips**: On line charts, tooltips show metric values with up to four decimal places so you can read small changes accurately.
     - **Stop runs**: When viewing an in-progress run, click the **action (<Icon icon="ellipsis" iconType="solid"/>)** menu, then click **Stop run**.
     - **View console logs**: View [console logs](/models/runs/view-logged-runs#logs) for active or completed runs, or download logs for completed runs. The app polls active runs for new log lines every 5 seconds. The most recent 10,000 lines display by default, and you can scroll backward to view older logs. Log search stays responsive even for large outputs.