TSQL - Regular Expression Example : Tsql Filter data based on Certain Pattern

i will let you how to use Regular Expression in Tsql using one example /

we need to filter the data of varchar column ,  value should be like DSx_HD_WSxx  example  DS1_HD_WS01_blablabla .
for this we can achieve by using 'DS__HD_WS__%'  but the problem is, we can also get DS10 or DS1000 .
In this case what pattern we need to use to accept any number after DS  then remaining as per previous patern.

we can achieve solution with the fallowing expression


'DS%[_]HD_WS%[_]%'


For single character we need to use  underscore _  and for many chacters we need to use %

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