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.
这种模式可以用在每次读取固定长度字符串的程序中，或者所连接的设备会突然送出大量字符的情况下。
This mode should be used if your application will always read a fixed number of characters, or if the connected device sends bursts of characters.
一般，如果不考虑模式串的长度，一个具有时间复杂度o (n)的算法应该是最优的了，但是事实不是如此。
General, if we do not consider the length of pattern, a time complexity o (n) algorithm should be optimal, but the fact is not the case.
一般，如果不考虑模式串的长度，一个具有时间复杂度o (n)的算法应该是最优的了，但是事实不是如此。
General, if we do not consider the length of pattern, a time complexity o (n) algorithm should be optimal, but the fact is not the case.
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