Orbeon Forms -验证正则表达式先行
Orbeon Forms -验证正则表达式先行
提问于 2020-07-20 20:48:40
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})?$') or xxf:is-blank(string(.))Orbeon Forms是否支持regex lookahead？正则表达式前视：https://www.regular-expressions.info/lookaround.html
回答 1
Stack Overflow用户
回答已采纳
发布于 2020-07-21 04:39:05
重写表达式而不使用前视。它匹配不超过6位数字的字符串。
使用
^(\d{1,4}(\.\d{1,2})?|\d{5}(\.\d)?|\d{6})$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
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原文链接：
https://stackoverflow.com/questions/62995742
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