How can I introspect a freemarker template to find out what variables it uses?

Question

I\'m not at all sure that this is even a solvable problem, but supposing that I have a freemarker template, I\'d like to be able to ask the template what variables it uses.<

Answer 1

Execute following regex on the template:

(?<=\$\{)([^\}]+)(?=\})

• (?<=\$\{) Matches everything followed by ${
• ([^\}]+) Matches any string not containing }
• (?=\}) Matches everything before }