this is to handle the RGB escape generated by `tput initc 1 500 500 500`
regex based on ECMA-48:
1. optional:
one of [ or ]
any amount of 0x30-0x3f
any amount of 0x20-0x2f
3. exactly one 0x40-0x7e
The pages are generated with Goldsv0.3.2. (GOOS=linux GOARCH=amd64)
Golds is a Go 101 project developed by Tapir Liu.
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