Text Expressions

A text expression is a {{ }} token in survey text. VeySur evaluates it per participant and replaces it with the result.

Where expressions can be used

The welcome message, group names and descriptions, question text and detail, subquestion text, answer option labels, and the thank-you message. A field may hold more than one token.

Available variables

Expressions use the same roots as conditions, plus two specific to text.

Root	Refers to
answers.<QuestionCode>	An earlier answer’s raw stored value, for calculations
answerLabels.<QuestionCode>	The same answer as readable text; empty when unanswered
labels.<Code>	Static text: a question, group, row, or option label
participant.<name>	A built-in field or a custom attribute
response.language	The language currently being viewed

See Variable Paths for addressing matrix cells, multi-part parts, and options.

Supported operations

Arithmetic, comparisons, the ternary operator (? :), and && || !. Strings support .includes(), .toLowerCase(), .toUpperCase(), .trim(), .length; arrays support .includes() and .length. Nothing else.

Restrictions

answers.* and answerLabels.* can only reference a question before the field they are in (the thank-you message is exempt; the welcome message can reference no answers). labels.* has no such restriction. An unsafe or unresolvable expression is left as plain text; check Preview to confirm every token resolves.

Examples

Hi {{participant.nameFirst}}, thanks for your time.
{{participant.city === "Liverpool" ? "As a local, " : ""}}what did you think?
For "{{labels.Q005}}" you chose {{answerLabels.Q005}}.