即使在这样一小段脚本中，您也可以找到一些参数扩展，包括长度、子字符串、模式匹配和模式替换。
You'll recognize several parameter expansions, including length, substring, pattern matching, and pattern replacement in even this short piece of script.
对于单字节字符编码模式，一个字节组成一个字符，单字节字符串的长度与字符串的字节长度相同。
In the case of a single-byte character encoding scheme, a single byte constitutes a character and the length of a single byte string is the same as the byte length of the string.
为了演示这个缺陷带来的问题，我测评了在长度为 10,690,488 的字符串中寻找模式 “Crachit*” 的所有实例所花费的时间。
To illustrate the problem that this causes, I benchmarked the time it takes to find all instances of the pattern "Crachit*" in a string with length 10,690,488.
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