difference between regioselective regiospecific stereospecific stereo selective??plzz explain

Regiospecific: a chemical reaction in which one structural isomer is produced exclusively when other isomers are also theoretically possible.

REgiosselectivity:regioselectivity is the preference of one direction of chemical bond making or breaking over all other possible directions.Eg: Marknonikoff''s rule.

stereospeciifc:A reaction in which the stereochemistry of the reactants controls the outcome of the reaction.

stereoselective:stereoselectivity is the property of a chemical reaction in which a single reactant forms an unequal mixture of stereoisomers