匹配空格，但不换行 [英] Match whitespace but not newlines

问题描述

我有时想匹配空格而不是换行符.

I sometimes want to match whitespace but not newline.

到目前为止，我一直在求助于[ \t].有没有那么尴尬的方法?

So far I've been resorting to [ \t]. Is there a less awkward way?

推荐答案

Perl版本5.10和更高版本支持辅助的垂直和水平字符类\v和\h，以及通用的空白字符类\s

Perl versions 5.10 and later support subsidiary vertical and horizontal character classes, \v and \h, as well as the generic whitespace character class \s

最干净的解决方案是使用水平空格字符类\h.这将匹配ASCII集中的制表符和空格，扩展ASCII或任何这些Unicode字符的不间断空格

The cleanest solution is to use the horizontal whitespace character class \h. This will match tab and space from the ASCII set, non-breaking space from extended ASCII, or any of these Unicode characters

U+0009 CHARACTER TABULATION
U+0020 SPACE
U+00A0 NO-BREAK SPACE (not matched by \s)

U+1680 OGHAM SPACE MARK
U+2000 EN QUAD
U+2001 EM QUAD
U+2002 EN SPACE
U+2003 EM SPACE
U+2004 THREE-PER-EM SPACE
U+2005 FOUR-PER-EM SPACE
U+2006 SIX-PER-EM SPACE
U+2007 FIGURE SPACE
U+2008 PUNCTUATION SPACE
U+2009 THIN SPACE
U+200A HAIR SPACE
U+202F NARROW NO-BREAK SPACE
U+205F MEDIUM MATHEMATICAL SPACE
U+3000 IDEOGRAPHIC SPACE

垂直空间模式\v不太有用，但可以匹配这些字符

The vertical space pattern \v is less useful, but matches these characters

U+000A LINE FEED
U+000B LINE TABULATION
U+000C FORM FEED
U+000D CARRIAGE RETURN
U+0085 NEXT LINE (not matched by \s)

U+2028 LINE SEPARATOR
U+2029 PARAGRAPH SEPARATOR

有七个与\v匹配的垂直空白字符和十八个与\h匹配的水平空白字符. \s匹配二十三个字符

There are seven vertical whitespace characters which match \v and eighteen horizontal ones which match \h. \s matches twenty-three characters

所有空格字符都是垂直或水平，没有重叠，但是它们不是正确的子集，因为\h还会匹配U + 00A0 NO-BREAK SPACE，并且\v也匹配U + 0085下一行，\s

All whitespace characters are either vertical or horizontal with no overlap, but they are not proper subsets because \h also matches U+00A0 NO-BREAK SPACE, and \v also matches U+0085 NEXT LINE, neither of which are matched by \s

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