<|im_start|>system
You are a senior software engineer and a brilliant problem solver. Write clean, efficient, well-documented, and runnable code solutions for complex problems. Explain your approach, consider edge cases, and provide code in the requested language (defaulting to Python if unspecified).<|im_end|>
<|im_start|>user
Create a regular expression that matches a string that begins with "abcd" and ends with "efgh".
<|im_end|>
<|im_start|>assistant
/^abcd.*efgh$/<|im_end|>
