Build calculated fields, CASE statements, and RegEx formulas for Looker Studio (Data Studio). Preview results with sample data.
Reporting logic can be drafted here before it is added to a Looker Studio data source or chart. The helper assembles calculated fields, searched CASE expressions, and regular-expression formulas, then evaluates them against sample rows supplied by the user. This makes category mappings and text-matching rules easier to inspect. The important distinction is that a successful preview checks the provided examples, not compatibility with every connector, field type, aggregation context, or value in the eventual report.
A concrete input and expected output from the current implementation.
Input
Formula: CASE WHEN Sessions >= 100 THEN "High" ELSE "Low" END Sample data: Sessions 125 80
Expected output
Sessions | Result 125 | High 80 | Low
The first row satisfies Sessions >= 100, so the CASE expression returns "High". The second row does not satisfy the condition and therefore follows the ELSE branch.
The helper organizes Looker Studio field references, comparisons, return values, CASE branches, and regular-expression conditions into formula syntax. It is suited to rules such as grouping campaign names, labeling traffic bands, or extracting parts of tracking values. The resulting expression is intended for use as a calculated field, subject to the fields and functions available in the destination report.
Sample values are evaluated against the drafted expression so each row can be compared with its calculated result. This exposes missing CASE branches, incorrect thresholds, and regular expressions that classify test strings unexpectedly. The preview uses only the entered samples and does not inspect a connected Looker Studio schema. Entered reporting data remains in the browser and is not uploaded.
Usually, if the referenced field names, value types, and functions match the destination data source. The preview cannot guarantee that a connector exposes the same schema or permits the expression in the chosen chart context. Check field names exactly and test the formula in Looker Studio before relying on it in a published report.
No. It evaluates only the sample data entered into the helper. Include representative matches, non-matches, boundary numbers, blank values, and unusual campaign strings when those cases matter. The preview does not query the live report or reveal categories that are absent from the sample rows.
The example and behavioral notes were checked against the browser implementation. Standards and primary references below define the relevant format, formula, or platform behavior.
Shorten URLs with local redirect tracking via localStorage. See click counts and generate a QR code for each link.
Build UTM-tagged URLs for campaign tracking with source, medium, campaign, term, and content parameters.
Enter 2+ headlines and see simulated previews in Google results, email subject lines, and social posts side-by-side.
Count characters for Twitter/X, LinkedIn, Facebook, and Instagram with platform-specific limits and warnings.
Calculate click-through rates from impressions and clicks with industry benchmarks and trend analysis.
Check email subject line length against best practices for desktop and mobile with preview text optimization.