问Orbeon Forms -验证正则表达式先行
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Stack Overflow用户

提问于 2020-07-20 12:48:40

回答 1查看 63关注 0票数 1

我想在文本字段上使用正则表达式验证公式。下面是一个纯正则表达式：

^(?!(?:\D*\d){7})\d+(\.\d{1,2})?$

当我在正则表达式在线工具(例如：https://regex101.com/)中测试这个表达式时，一切正常。但当我尝试在Orbeon中使用它作为验证器时，如下所示：

matches(string(.), '^(?!(?:\D*\d){7})\d+(\.\d{1,2})?$')  or xxf:is-blank(string(.))

我得到错误‘不正确的XPath表达式’。

当我从正则表达式先行部分中删除时，我就可以使用它了。

matches(string(.), '^\d+(\.\d{1,2})?$')  or xxf:is-blank(string(.))

Orbeon Forms是否支持regex lookahead？正则表达式前视：https://www.regular-expressions.info/lookaround.html

orbeon

regex

回答 1

Stack Overflow用户

回答已采纳

发布于 2020-07-20 20:39:05

重写表达式而不使用前视。它匹配不超过6位数字的字符串。

使用

^(\d{1,4}(\.\d{1,2})?|\d{5}(\.\d)?|\d{6})$

请参阅proof

解释

NODE                     EXPLANATION
--------------------------------------------------------------------------------
  ^                        the beginning of the string
--------------------------------------------------------------------------------
  (                        group and capture to \1:
--------------------------------------------------------------------------------
    \d{1,4}                  digits (0-9) (between 1 and 4 times
                             (matching the most amount possible))
--------------------------------------------------------------------------------
    (                        group and capture to \2 (optional
                             (matching the most amount possible)):
--------------------------------------------------------------------------------
      \.                       '.'
--------------------------------------------------------------------------------
      \d{1,2}                  digits (0-9) (between 1 and 2 times
                               (matching the most amount possible))
--------------------------------------------------------------------------------
    )?                       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
--------------------------------------------------------------------------------
    \d{5}                    digits (0-9) (5 times)
--------------------------------------------------------------------------------
    (                        group and capture to \3 (optional
                             (matching the most amount possible)):
--------------------------------------------------------------------------------
      \.                       '.'
--------------------------------------------------------------------------------
      \d                       digits (0-9)
--------------------------------------------------------------------------------
    )?                       end of \3 (NOTE: because you are using a
                             quantifier on this capture, only the
                             LAST repetition of the captured pattern
                             will be stored in \3)
--------------------------------------------------------------------------------
   |                        OR
--------------------------------------------------------------------------------
    \d{6}                    digits (0-9) (6 times)
--------------------------------------------------------------------------------
  )                        end of \1
--------------------------------------------------------------------------------
  $                        before an optional \n, and the end of the
                           string