您要使用正则表达式来实现该蒙版。

You use regular expressions to implement the mask.

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特别是需要使用正则表达式时。

Especially when regular expressions are involved.

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要进行这一验证，需要使用正则表达式。

To do so, you use a regular expression.

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在元素中指定模式时，请注意，要使用正则表达式来执行匹配和字符串替换。

When specifying patterns in the element, realize that regular expressions are used to perform the matching and string replacement.

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如果您遇到一个需要使用正则表达式函数的实例，则您将很可能要创建用户定义的函数来处理您的要求。

If you come across an instance where you need to use regular expression functions, then you will likely have to create user-defined functions to handle your requirement.

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当要使用多个反向引用时，正则表达式很快就会变得令人迷惑而且很难去理解。

When using multiple back references, a regular expression can quickly become confusing and hard to understand.

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然而，对于很少使用的正则表达式，则不要使用Compiled，否则会增加启动成本和内存开销。

However, for regular expressions that are rarely used, do not use Compiled as it causes increased startup costs and memory overhead.

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在此示例中，您甚至不需要使用数组或正则表达式库，因为使用到grep的管道容易多了。

In this example, you don't even need to use an array or a regular expression library, because a pipe to grep is much easier.

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在此示例中，您甚至不需要使用数组或正则表达式库，因为使用到grep的管道容易多了。

In this example, you don't even need to use an array or a regular expression library, because a pipe to grep is much easier.

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