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Bulk renaming in Regex

Bulk Renaming Utility is used. May not work somewhere else, unless you add the necessary flags.

Removing all underscores from the start of a string.

(_){0,}(.*)

2 Groups, group one catches an underscore, group one is repeated 0 to an unlimited times {0,} to capture all underscores before group 2 starts (.*). Group 2 captures all characters. Then we replace the string by the result of goup 2 only \2,