Regular-expression support is minimal at best and can often be unrecognized or unprocessable for complex queries that regular grep can handle easily.
正则表达式支持有可能并且通常会无法识别或不能处理复杂查询，而正则grep 却可以轻松处理。
Regular-expression support is minimal at best and can often be unrecognized or unprocessable for complex queries that regular grep can handle easily.
正则表达式支持有可能并且通常会无法识别或不能处理复杂查询，而正则grep 却可以轻松处理。
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