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^ ......... start of a line
(x|y|z) ... OR expression with 3 arguments
[^c] ...... first OR argument matches all lines not starting with character 'c'.
c[^:] ..... second OR argument matches all lines starting with character 'c'
but second character is not a ':'.
c:[^\\] ... third OR argument matches all lines starting with "c:"
but third character is not a '\'.
.*$ ....... matches the rest of the line without the line termination
characters (CRLF for DOS).