system.Text.RegularExpressions.Regex.Replace(txt, "(?m)(Mainstep)[\s]", modifyValue)
where txt =
Mainstep_EWMA
Mainstep
Mainstep_0102
Mainstep_0304
system.Text.RegularExpressions.Regex.Replace(txt, "(?m)(Mainstep)[\s]", modifyValue)
where txt =
Mainstep_EWMA
Mainstep
Mainstep_0102
Mainstep_0304