Regula was put on waivers Tuesday, Chris Johnston of TSN reports.
Regula inked a one-year, two-way contract with Boston on Monday.
Boston acquired Regula and Ian Mitchell from Chicago on Monday in exchange for forwards Taylor Hall and Nick Foligno.
Regula was demoted to AHL Rockford on Thursday, Charlie Roumeliotis of NBC Sports Chicago reports.
Regula was recalled by the Blackhawks on Tuesday, Charlie Roumeliotis of NBC Sports Chicago reports.
Regula was reassigned to AHL Rockford after Wednesday's game versus the Golden Knights, Scott Powers of The Athletic reports.
Regula was promoted from AHL Rockford on Tuesday, Carter Baum of the Blackhawks' official site reports.
Regula was reassigned to AHL Rockford on Sunday, Charlie Roumeliotis of NBC Sports Chicago reports.
Regula was promoted from AHL Rockford on Tuesday, per Charlie Roumeliotis of NBC Sports Chicago.
Regula was reassigned to AHL Rockford on Thursday, per Charlie Roumeliotis of NBC Sports Chicago.