Separate out the (, ), |,not etc. by splitting the string up based on what you find. You could add some logic to split the string into an array from where those characters are found and look to the values to the left if an OR (||) is found, for example. Then put that logic into a function like below:
(Add in your complex logic to a function like this:) /** * Converts a string representation of a boolean to a true boolean value. * For example, it will convert "TRUE", "False", "true", "TruE", "f", or "T" to a real boolean (true or false). * The input string is not case-sensitive. Acceptable arguments are the word "true" or "false", or the letter "t" or "f". * @param value the string to convert to a boolean. * @return representation of the string as a true boolean value. **/ public static function stringToBoolean(value:String):Boolean { var boolean:Boolean = false; if (value.toLowerCase() == "true") boolean = true; if (value.toLowerCase() == "t") boolean = true; return boolean; } No small task though. Jason Merrill Instructional Technology Architect II Bank of America Global Learning _______________________ From: flexcoders@yahoogroups.com [mailto:flexcoders@yahoogroups.com] On Behalf Of BillF Sent: Thursday, January 26, 2012 12:36 PM To: flexcoders@yahoogroups.com Subject: [flexcoders] Evaluating a Boolean String Expression So, I have a string expression that I need to evaluate as a boolean result. Any ideas on how to do that? The expression can be in any valid boolean format.. example1: "(true && false) || true", evaluate to true example2: "false || (true && not true)", evaluate to false example3: "false || true", evaluate to true example4: "true && false", evaluate to false example5: "true" TIA Bill ---------------------------------------------------------------------- This message w/attachments (message) is intended solely for the use of the intended recipient(s) and may contain information that is privileged, confidential or proprietary. If you are not an intended recipient, please notify the sender, and then please delete and destroy all copies and attachments, and be advised that any review or dissemination of, or the taking of any action in reliance on, the information contained in or attached to this message is prohibited. Unless specifically indicated, this message is not an offer to sell or a solicitation of any investment products or other financial product or service, an official confirmation of any transaction, or an official statement of Sender. Subject to applicable law, Sender may intercept, monitor, review and retain e-communications (EC) traveling through its networks/systems and may produce any such EC to regulators, law enforcement, in litigation and as required by law. The laws of the country of each sender/recipient may impact the handling of EC, and EC may be archived, supervised and produced in countries other than the country in which you are located. This message cannot be guaranteed to be secure or free of errors or viruses. References to "Sender" are references to any subsidiary of Bank of America Corporation. Securities and Insurance Products: * Are Not FDIC Insured * Are Not Bank Guaranteed * May Lose Value * Are Not a Bank Deposit * Are Not a Condition to Any Banking Service or Activity * Are Not Insured by Any Federal Government Agency. Attachments that are part of this EC may have additional important disclosures and disclaimers, which you should read. This message is subject to terms available at the following link: http://www.bankofamerica.com/emaildisclaimer. By messaging with Sender you consent to the foregoing.