A regexp to parse color escape sequence could be:

m/\\033\[(\d+)(?:;(\d+)(?:;(\d+))?)?m/;
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I tested three cases:

1. \033[0m, gives me $1 = 0, $2 and $3 undefined. Correct;
2. \033[1;31m, gives me $1 = 1, $2 = 31, and $3 undefined. Correct;
3. \033[1;31;44m, gives me $1 = 1, $2 = 31, and $3 = 44. Correct.