Question

我的这个正则表达式非常适合匹配U.S.A格式的货币值（$ 1.50）：

Regex money = new Regex(@"\w\^\$(\d{1,3}(\,\d{3})*|(\d+))(\.\d{2})?$");

我想帮助理解如何构建这样的正则表达式，我需要更改我的国家/地区的格式，例如更改 $ R $ 。

我正在寻找msdn主题但到目前为止没有任何工作......

Answer 1

你的问题有三个部分，对我而言，听起来主要是关于“学习如何捕鱼”，这很棒。

** A。你想要的正则表达式

根据评论，您正在寻找这个（see demo）：

^R\$\d+(?:\.\d{3})*,\d{2}$

<强> B中。正则表达式的解释

这是一个相对简单的正则表达式，为此您可以阅读自动生成的解释。有几个网站这样做。这是one（它会在原始网站上显示得更好）。

NODE                     EXPLANATION
--------------------------------------------------------------------------------   \w                       word characters (a-z, A-Z, 0-9, _)
--------------------------------------------------------------------------------   \^                       '^'
--------------------------------------------------------------------------------   \$                       '$'
--------------------------------------------------------------------------------   (                        group and capture to \1:
--------------------------------------------------------------------------------
    \d{1,3}                  digits (0-9) (between 1 and 3 times
                             (matching the most amount possible))
--------------------------------------------------------------------------------
    (                        group and capture to \2 (0 or more times
                             (matching the most amount possible)):
--------------------------------------------------------------------------------
      \,                       ','
--------------------------------------------------------------------------------
      \d{3}                    digits (0-9) (3 times)
--------------------------------------------------------------------------------
    )*                       end of \2 (NOTE: because you are using a
                             quantifier on this capture, only the
                             LAST repetition of the captured pattern
                             will be stored in \2)
--------------------------------------------------------------------------------    |                        OR
--------------------------------------------------------------------------------
    (                        group and capture to \3:
--------------------------------------------------------------------------------
      \d+                      digits (0-9) (1 or more times
                               (matching the most amount possible))
--------------------------------------------------------------------------------
    )                        end of \3
--------------------------------------------------------------------------------   )                        end of \1
--------------------------------------------------------------------------------   (                        group and capture to \4 (optional
                           (matching the most amount possible)):
--------------------------------------------------------------------------------
    \.                       '.'
--------------------------------------------------------------------------------
    \d{2}                    digits (0-9) (2 times)
--------------------------------------------------------------------------------   )?                       end of \4 (NOTE: because you are using a
                           quantifier on this capture, only the LAST
                           repetition of the captured pattern will be
                           stored in \4)
--------------------------------------------------------------------------------   $                        before an optional \n, and the end of the
                           string

<强>℃。我怎样才能学会构建像这样的正则表达式

以下是我推荐的资源。

书籍：掌握正则表达式（第3版），Regex Cookbook
网站：regular-expressions.info，RexEgg，FAQ on SO
工具：RegexBuddy（商业但出色的调试器），regex101.com，Debuggex.com

Answer 2

您只需在正则表达式中添加R即可：

Regex rmoney = new Regex(@"\w\^R\$(\d{1,3}(\,\d{3})*|(\d+))(\.\d{2})?$");

正则表达货币价值

2 个答案: