Regex for Finding Radioactive Elements

Char Count 61

lon|ct|oh|^ra|...t.+i|^c?u|or.+u|r.+c.|e..+e|f.?e|^h?as|be*.i

One 3 characters better than accepted answer!

63-character solution found with Peter Norvig's Regex golf solver. 61-character improvement found by a personal rewrite of that program in Go.

Char count 64

^(c?u|ra|no)|e.[kht]|[^l][gecv]i|[^c]oh?[rn]iu|f.r|ac|sta|bn|has

Should note, used parts of qw3n solution to reduce down my solution. Also used Peter Taylor's suggestion to trim two characters.

Char count 69

^u|e.[kht]|[^l][gecv]i|[^c]oh?[rn]iu|^cu|f[oe]|a[cds]t|has|nob|rad|du

Curium/Cerium are a pain to deal with