Character classes are faster than alternation because they are implemented using bit vectors (or other fast implementations) rather than backtracking.
字符类比分支更快，因为他们使用位向量实现(或其他快速实现)而不是回溯。
Character classes are faster than alternation because they are implemented using bit vectors (or other fast implementations) rather than backtracking.
字符类比分支更快，因为他们使用位向量实现(或其他快速实现)而不是回溯。
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