Python3:
import re k = "X" s = "X测试一Q测试二XQ测试三" print(re.split((r"\b" + k + r"\b"), s)) Output:
['X测试一Q测试二XQ测试三'] Expected:
['', '测试一Q测试二XQ测试三'] 
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1 Answer
The 测 is a letter belonging to the \p{Lo} class and there is no word boundary between X and 测.
A \b word boundary construct is Unicode-aware by default in Python 3.x re patterns, so you might switch this behavior off by using the re.ASCII / re.A option, or the inline (?a) flag:
import re k = "X" print( re.split(fr"(?a)\b{k}\b", "X测试一Q测试二XQ测试三") ) See the regex demo and the Python demo.
If you need to make sure there is no ASCII letter before and after X, use (?<![a-zA-Z])X(?![a-zA-Z]). Or, including digits, (?<![a-zA-Z0-9])X(?![a-zA-Z0-9]).