Question

EDIT: 工作管理机构(第二组):

(^|[ ,	
]+)([0-9\.]+)($|[ ,	
]+)

原定员额:

I m new to Haskell, aiming to use text.Regex ( From regex-compat) to extracts Value from a string. 我希望我能与任何一系列数字和时间相匹配,这些数字和期限至少有一个分离特性与左边和右边。这是我写的:

regex = "[^ 	
,]+([0-9\.])+[$ 	
,]+"

EDIT:我最初认为,这在Schala是正常的,但现在我完全相信,我只是带着我的试卷str。这在Haskell没有工作。例如:

matchRegexAll (mkRegex regex) " 12.34 "

产量

Just (" ","12.34 ","",["4"])

在我看来,它应当产生结果。

Just (""," 12.34 ","",["12.34"])

Another example:

matchRegexAll (mkRegex regex) "12.34"

产量

Nothing

when it I think it should yield

Just ("","12.34","",["12.34"])

I m guessing the parser 处理“^”和“$”的方式与Schala parser不同,但所有I ve都是如此。

Answer 1

Inside a character class like [^ ,], normal regex metacharacters (such as ^ and $) lose their special meaning; they match themselves instead.¹ Something like (^|[ ,]) should do what you want.

我感到惊讶的是,你在Schala的reg工作;我从未看到过一种以这种方式行事的reg。

<>1> 虽然FlopCoder指出,但^ >,在性质类别开始时,实际上negates/em>。

Answer 2

www.un.org/spanish/ga/president 使用<>条码[和<条码>。如果您希望从开始就把reg/条码同起来,则在reg开始之初就将<条码>。

如果你想将其用作座标的结尾,请上<条码>。

Answer 3

This "[^ ,]+([0-9\.])+[$ ,]+" matches a nonempty sequence of characters which are none of , , , , ] greedily, a nonempty sequence of digits or dots, and a nonempty sequence of any of "$ ,", capturing the penultimate of the sequences. The first matches " 12.3", the second/penultimate is only left to match "4".

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