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    <p>Something like this might work, no expert on RegExp tho.</p> <pre><code>var s:String = "www.something.com@param1={{^User Name^}},param2={{^user id^}}"; var userPattern:RegExp = /(?&lt;=param1=)({{\^)([A-Za-z0-9 ])*(\^}})/; var userIdPattern:RegExp = /(?&lt;=param2=)({{\^)([A-Za-z0-9 ])*(\^}})/; s = s.replace(userPattern,'username'); s = s.replace(userIdPattern,'user_id'); </code></pre> <p>If you want to replace only the string inside {{}} maby this would work:</p> <pre><code>var s:String = "www.something.com@param1={{^User Name^}},param2={{^user id^}}"; var userPattern:RegExp = /(?&lt;=param1={{)\^([A-Za-z0-9 ])*\^(?=}})/; var userIdPattern:RegExp = /(?&lt;=param2={{)\^([A-Za-z0-9 ])*\^(?=}})/; s = s.replace(userPattern,'username'); s = s.replace(userIdPattern,'user_id'); </code></pre> <p>To remove multiple {{}} for exampe www.something.com@param1={{^User Name^}},{{^,e,^}},param2={{^user id^}} between paramX try this:</p> <pre><code>var s:String = "www.something.com@param1={{^User Name^}},{{^,e,^}},param2={{^user id^}}"; var userPattern:RegExp = /(?&lt;=param1={{)\^([A-Za-z0-9\^}}{{, ])*(?=}})/; var userIdPattern:RegExp = /(?&lt;=param2={{)\^([A-Za-z0-9\^}}{{, ])*(?=}})/; s = s.replace(userPattern,'username'); s = s.replace(userIdPattern,'user_id'); </code></pre> <p>Output should be www.something.com@param1={{username}},param2={{user_id}}.</p> <p>Another example:</p> <pre><code>var s:String = "www.something.com@param1={{^User Name^}},{{^,e,^}},param2={{^user id^}}"; var userPattern:RegExp = /(?&lt;=param1=)({{\^)([A-Za-z0-9\^}}{{, ])*(})/; var userIdPattern:RegExp = /(?&lt;=param2=)({{\^)([A-Za-z0-9\^}}{{, ])*(})/; s = s.replace(userPattern,'username'); s = s.replace(userIdPattern,'user_id'); </code></pre> <p>Output should be www.something.com@param1=username,param2=user_id.</p>
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    1. COeldamar, Thanks a lot your first solution helps to solve the problem for some extent.However, i got a small problem when using above regEx, when i use it it returns the {{^User Name^}} tag with additional characters, something like this {{^Field Name^}},{{^,e,^}}. if i can get rid of this additional tags, i can easily manage to resolve my problem. Same thing happens to other regEx as well. (userIdPattern).
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    2. CONot sure i understand but you need to add all the expected characters inside {{}} by adding them to the [A-Za-z0-9 ] part of the RegEx, ex: [A-Za-z0-9,.-@# ]
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    3. COWhat i meant by additional tags is {{^,e,^}} part. When i run above script "s.match(userpattern)" it returns this -{{^Field Name^}},{{^,e,^}}. i am looking a way to get rid of {{^,e,^}} part from above return value. what i need only {{^Field Name^}} part. Thanks
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