Click the Expression Browse button in any dialog box which requires you to enter or edit an expression to launch the Expression Browser dialog box, in which you can interactively build an expression by selecting from lists of variables, properties, operators, functions, and the TestStand API.

The Expression Browser contains the following tabs for building expressions :

• Variables/Properties —Select variables and properties from this tab.
• Operators/Functions —Select operators and functions from this tab.
• TestStand API —Select properties and methods from the TestStand API from this tab.

In addition to the Variables/Properties, Operators/Functions, and TestStand API tabs, the Expression Browser dialog box contains the following options:

• Expression —The expression you build interactively using the tabs above. You can also type an expression directly into this control.
• Check Syntax —Verifies the syntax of the expression in the Expression control.

The expression editor includes visual assistance for finding and manipulating nested delimiters such as parenthesis, brackets, and braces.

• Place your cursor to the left of a delimiter and the expression editor makes the matching pair bold.
• Type <Ctrl + ]> to toggle the cursor between the matching delimiters.
• Type <Ctrl + Shift + ]> to select the matching delimiters and everything between them.