Question

myPattern = @"?:[.]?[d]+(?:[,.]*d)*";

然而,我要排除美元签字后的数字,并想排除括号中的数字()}[]。

例如:

input text (match)
-----------------------------
abc123,000.5xyz (match:123,000.5)
abc.5xyz (match:.5)
abc0.2xyz  (match:0.2)
abc123.2xyz (match:123.2)
abc$123xyz (false)
abc(123)77xyz (match:77)
abc12{123}xyz (match:12)
abc[123]xyz (false)

Answer 1

您可使用这一规章:

(?<![${([d])d+(,d{3})*(.d+)?(?![]})])

这与:

(?<![${([d]) : negative lookbehind for $, (, [, { or a digit (the latter prevents matching from the middle of a sequence of digits)
d+(,d{3})*(.d+)? : regex to match a number with optional thousands and decimal parts
(?![]})]) : negative lookahead for ], }, or )

Regex demo on regex101 。

Answer 2

最容易的是,放松对你的要求,并用零宽的说法:

(?<![[({$])((?:d+(?:[,.]d+)?)|(?:[,.]d+))

That will capture all numbers NOT preceded by [({$, ie. we don t check if they are inside a full set of brackets/parentheses.

(?<![[({$]) will do the check for the preceding char
(?:d+(?:[,.]d+)?) numbers with xxx.xxx or just xxx
(?:[,.]d+) numbers with .xxx

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