clean: yes

# Error 1: escaped number too long.  Max 4 hex digits
# css-prefix: \77777abc

# Error 2: class prefix starts with digit
# css-prefix: 77abc

# Error 3: Unescaped invalid character
# css-prefix: abc

# OK 1: Plain old name
# css-prefix: abc123

# OK 2: Begin w/ escaped number
# css-prefix: \77abc

# OK 3: escaped number
css-prefix: abc\8