vars

var ChainVar = regexp.MustCompile(`\$\{[^}]*\.[^}]+\}|\$[a-zA-Z0-9_\-]+\.[a-zA-Z0-9_\-\.]+`)

ChainVar matches ${step.field} patterns (contains a dot).

var EnvOnly = regexp.MustCompile(`\$\{([A-Za-z_][A-Za-z0-9_]*)\}|\$([A-Za-z_][A-Za-z0-9_]*)`)

EnvOnly matches $VAR and ${VAR} patterns without dots (environment variables only). Group 1: contents inside ${...} Group 2: token after $...

var Expansion = regexp.MustCompile(`\$\{([^}]+)\}|\$([a-zA-Z0-9_\-\.]+)`)

Expansion matches $VAR and ${VAR} patterns, including dots for chain references. Group 1: contents inside ${...} Group 2: token after $...