[^A-Za-z0-9\-\.] All characters that do not match this regular expression will be replaced with underscores ( _ ). Example: B+-+ONGOING+-+2021+-+RMKT+-+DYNAMIC+-+QC+-+EN'' will become B_-_ONGOING_-_2021_-_RMKT_-_DYNAMIC_-_QC_-_ENaffiaffiliationaffiliatedisplayvideocpmcpcretargetingadvertisingrtbpubmediaprerollsocialpaid-socialpaidsocial