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| a|b|c - means contains the strings "a" or "b" or "c" | |
| ^(a|b|c)$ - means IS the string 'a' or 'b' or 'c' same as: %in% c('a','b','c') | |
| ^(a|b|c) - means begins with 'a' or 'b' or 'c' | |
| (a|b|c)$ - means ends with 'a' or 'b' or 'c' | |
| ^[a-zA-Z0-9]*$ - means IS the string contains only a-z, A-Z or 0-9 |
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