Remove special character from a string filed to create a number field. " "

Hello Alteryx Experts, 

I am trying to remove some special character from a string field, that could allow me to change the type to a number field.  

The original number looks like " <$145,200.99>,  and I want to convert it to  145200.99.    

I tried "Regex_replace" function also the tool of RegEx, but I am not familiar with how to use RegEx language at all... some one please advise.   

Thank you in advance! 

Flora