Make SigmaClip repr/str tests use SigmaClip._parse_cenfunc instead of re.match to match the substrings containing a median/std repr (so it doesn't only work with bottleneck installed or depend on the CPython __str__ implementation).
Make SigmaClip repr/str tests use SigmaClip._parse_cenfunc instead of re.match to match the substrings containing a median/std repr (so it doesn't only work with bottleneck installed or depend on the CPython __str__ implementation).

aleksandr-bakanov/astropy,lpsinger/astropy,pllim/astropy,lpsinger/astropy,mhvk/astropy,astropy/astropy,pllim/astropy,pllim/astropy,lpsinger/astropy,StuartLittlefair/astropy,saimn/astropy,aleksandr-bakanov/astropy,mhvk/astropy,dhomeier/astropy,larrybradley/astropy,larrybradley/astropy,saimn/astropy,mhvk/astropy,lpsinger/astropy,astropy/astropy,aleksandr-bakanov/astropy,larrybradley/astropy,pllim/astropy,larrybradley/astropy,dhomeier/astropy,dhomeier/astropy,StuartLittlefair/astropy,astropy/astropy,dhomeier/astropy,aleksandr-bakanov/astropy,dhomeier/astropy,astropy/astropy,lpsinger/astropy,saimn/astropy,saimn/astropy,StuartLittlefair/astropy,mhvk/astropy,pllim/astropy,saimn/astropy,astropy/astropy,mhvk/astropy,StuartLittlefair/astropy,larrybradley/astropy,StuartLittlefair/astropy