grepRaw(base)
grepRaw()所属R语言包：base
Pattern Matching for Raw Vectors
模式匹配为原料矢量图
译者：生物统计家园网 机器人LoveR
描述----------Description----------
grepRaw searches for substring pattern matches within a raw vector x.
grepRaw搜索子串pattern在原始向量x比赛。
用法----------Usage----------
grepRaw(pattern, x, offset = 1L, ignore.case = FALSE,
value = FALSE, fixed = FALSE, all = FALSE, invert = FALSE)
参数----------Arguments----------
参数：pattern
raw vector containing a regular expression (or fixed pattern for fixed = TRUE) to be matched in the given raw vector. Coerced by charToRaw to a character string if possible.
要在给定的原始向量匹配一个正则表达式（或固定的模式fixed = TRUE）原始向量。 charToRaw强制转换为字符串，如果可能的话。
参数：x
a raw vector where matches are sought, or an object which can be coerced by charToRaw to a raw vector.
比赛寻求原始向量，或可以通过charToRaw原始向量裹挟的对象。
参数：ignore.case
if FALSE, the pattern matching is case sensitive and if TRUE, case is ignored during matching.
如果FALSE，模式匹配是大小写敏感的，如果TRUE，情况在匹配过程中忽略。
参数：offset
An integer specifying the offset from which the search should start. Must be positive. The beginning of line is defined to be at that offset so "^" will match there.
一个整数，指定偏移量从搜索开始。必须是积极的。开头的行被定义为偏移，所以"^"将匹配。
参数：value
logical. Determines the return value: see "Value".
逻辑。确定返回值：看到“价值”。
参数：fixed
logical. If TRUE, pattern is a pattern to be matched as is.
逻辑。如果TRUE，pattern是一个被视为是匹配的模式。
参数：all
logical. If TRUE all matches are returned, otherwise just the first one.
逻辑。如果TRUE所有的比赛都回来了，否则只是第一个。
参数：invert
logical. If TRUE return indices or values for elements that do not match. Ignored (with a warning) unless value = TRUE.
逻辑。如果TRUE回报指数或不匹配的元素的值。忽略（警告），除非value = TRUE。
Details
详情----------Details----------
Unlike grep, seeks matching patterns within the raw vector x . This has implications especially in the all = TRUE case, e.g., patterns matching empty strings are inherently infinite and thus may lead to unexpected results.
不像grep，力求在原始向量x匹配模式。这种影响，尤其是在all = TRUE的情况下，如，空字符串模式匹配本质上是无限的，因此可能会导致意想不到的结果。
The argument invert is interpreted as asking to return the complement of the match, which is only meaningful for value = TRUE. Argument offset determines the start of the search, not of the complement. Note that invert = TRUE with all = TRUE will split x into pieces delimited by the pattern including leading and trailing empty strings (consequently the use of regular expressions with "^" or "$" in that case may lead to less intuitive results).
被解释为要求返回的比赛，这是唯一有意义的invert补的说法value = TRUE。参数offset决定了搜索的开始，不补。请注意，invert = TRUEall = TRUE将分裂x分隔成片的模式，包括开头和结尾的空字符串（因此使用正则表达式"^"或"$" 在这种情况下，可能会导致不直观的结果）。
Some combinations of arguments such as fixed = TRUE with value = TRUE are supported but are less meaningful.
参数，如一些组合fixed = TRUE用value = TRUE支持，但意义不大。
值----------Value----------
grepRaw(value = FALSE) returns an integer vector of the offsets at which matches have occurred. If all = FALSE then it will be either of length zero (no match) or length one (first matching position).
grepRaw(value = FALSE)返回一个整数向量在比赛时有发生偏移。如果all = FALSE然后它会是长度为零（没有匹配）或长度（第一个匹配的位置）。
grepRaw(value = TRUE, all = FALSE) returns a raw vector which is either empty (no match) or the matched part of x.
grepRaw(value = TRUE, all = FALSE)返回一个原始的向量，这是空的（没有匹配）或匹配的部分x。
grepRaw(value = TRUE, all = TRUE) returns a (potentially empty) list of raw vectors corresponding to the matched parts.
grepRaw(value = TRUE, all = TRUE)返回的列表（可能为空）匹配的部分对应的原始向量。
源----------Source----------
The TRE library of Ville Laurikari (http://laurikari.net/tre/) is used except for fixed = TRUE.
该居民企业库威乐Laurikari（http://laurikari.net/tre/）用于除了fixed = TRUE。
参见----------See Also----------
regular expression (aka regexp) for the details of the pattern specification.
正则表达式（又名regexp）的模式规范的细节。
grep for matching character vectors.
grep匹配的特征向量。
转载请注明:出自 生物统计家园网(http://www.biostatistic.net)。
注：
注1：为了方便大家学习，本文档为生物统计家园网机器人LoveR翻译而成，仅供个人R语言学习参考使用，生物统计家园保留版权。
注2：由于是机器人自动翻译，难免有不准确之处，使用时仔细对照中、英文内容进行反复理解，可以帮助R语言的学习。
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发表于 2012-2-16 17:28:49
