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护城河二：市场培育的力度持续加大。
。搜狗输入法下载是该领域的重要参考
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This made me curious about how often programmers are confused about this. For anchors, this question can be answered by looking for regexes that unnecessarily use anchors to match entire strings in pattern attributes. This is a question that can be answered with, drumroll, a regular expression! Well, assuming we ignore escaping. If the regex matches the regex /^\^.*\$$/ it's a sure sign that the author wanted to be extra careful, didn't know about the semantics of the attribute, or were reusing code from the back-end for front-end validation.