Tag: variable-width

Understanding address assignment to registers via assembly instructions

If I have a CPU/system with the following characteristics… 16 bit architecture (16 bit registers and bus) 8 total registers A set of 64 assembly instructions And assuming my assembly instructions follow the format… OPCode (6 bits) + Register (3 bits) + Register (3 bits) + Unused (4 bits) ** Example Instructions (below) ** Assembly:… Read More Understanding address assignment to registers via assembly instructions

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Regex Error: A lookbehind assertion has to be fixed width

My pattern works in JavaScript. (?<=(?:username|Email|URL)(?:\s|:))[^\n]+ However, when I try to use it in PHP, I get this error: A lookbehind assertion has to be fixed width How I can fix it? Demo: https://regex101.com/r/x2W3S5/1 >Solution : Use a full string match restart (\K) instead of the invalid variable-length lookbehind. Regex 101 Demo (?:username|Email|Url):? *\K[^\v]+ Make… Read More Regex Error: A lookbehind assertion has to be fixed width

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