how to do Relational Operators for String Value in business rule

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Hi All,

is there any way to do Relational Operators for string value in Business Rule?

we have string vales like -10.0 to 10.0 on the basis of these value we are planning to redirect incident to different queues. not sure if i can make business rule like:

 if (String Value >=0 & String Value <=10) then transfer incident to X Queue

if (String Value >= -10.1 & String Value <=0) then transfer incident to Y Queue

please advise