Postman Pre-Request Script Variable Substitution

variable_substitution_prerequest.js

function replaceVariables(templateString) {
    let tokens = _.uniq(templateString.match(/{{\w*}}/g))
    
    _.forEach(tokens, t => {
       let variable = t.replace(/[{}]/g, '') 
       let value = environment[variable] || globals[variable]
       templateString = templateString.replace(new RegExp(t,'g'), value)
    });
    
    return templateString
}