The version at https://www.ncsc.gov.uk/content/files/regex_cross_hard_v3.pn... has S[MVU]... for column H. Guess nobody tested it.
Column H pattern starts [MVFU]{2}, and 3 of those options don't match the Row 0 pattern, leaving "U" The published solution says H0 should be "S".
The version at https://www.ncsc.gov.uk/content/files/regex_cross_hard_v3.pn... has S[MVU]... for column H. Guess nobody tested it.
Column H pattern starts [MVFU]{2}, and 3 of those options don't match the Row 0 pattern, leaving "U" The published solution says H0 should be "S".