Backtracking: everyone in the field knows that backtracking engines (PCRE, java, dotnet, javascript, PHP, ruby, python..) are bad because they are the poster child of denial of service attacks. O(2^n) match time complexity is not good. most backtracking implementations are a combination of clever optimizations duct taped to a very slow engine - for simple cases it works well, but using a pattern that is not affected by the optimizations, you get to see what the “real” worst-case behavior looks like.
海警机构依照《中华人民共和国海警法》的规定，在职责范围内对自然保护区区域内海岸线向海一侧的保护情况进行监督检查，依法查处违法行为。。同城约会对此有专业解读
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