Hi guys, I have a code that check if a certain object is a regexp by evaluating the expression " regexp_literal instanceof RegExp". When I evaluate the code in a node REPL it returns true. But when I evaluate it using a sandboxed-module (I use it for DI in my unit tests) the same expression evaluates to false.
Tracking down this odd behavior I wen't writing this "proof-of-concept" code: --[ https://gist.github.com/2560249 ]-- var reg = /^[a-z]$/; console.log('case 01: typeof /^[a-z]$/ returns %s', typeof reg); console.log('case 02: /^[a-z]$/ instanceof RegExp returns %s', reg instanceof RegExp); console.log('case 03: /^[a-z]$/.constructor.name === "RegExp" returns %s', reg.constructor.name === 'RegExp'); var util = require('util'), vm = require('vm'), sandbox = { u: reg }; vm.runInNewContext('out1 = /^[a-z]$/ instanceof RegExp; out2 = u instanceof RegExp; u_name = u.constructor.name', sandbox); console.log(util.inspect(sandbox)); When I run this code I got the following output: hobbes:weird ericchaves$ node app.js case 01: typeof /^[a-z]$/ returns object case 02: /^[a-z]$/ instanceof RegExp returns true case 03: /^[a-z]$/.constructor.name === "RegExp" returns true { u: /^[a-z]$/, u_name: 'RegExp', out1: true, out2: false } Why is that the out2 is false? isn't the variable U inside the sandbox a regexp? Couls someone help me out understanding this odd behavior? Cheers, Eric -- Job Board: http://jobs.nodejs.org/ Posting guidelines: https://github.com/joyent/node/wiki/Mailing-List-Posting-Guidelines You received this message because you are subscribed to the Google Groups "nodejs" group. To post to this group, send email to nodejs@googlegroups.com To unsubscribe from this group, send email to nodejs+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/nodejs?hl=en?hl=en
