Orbeon Forms-验证正则表达式前瞻

Question

我想在文本字段上使用正则表达式验证公式。这里是纯正则表达式：

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

当我在regex在线工具中测试这个表达式时(例如：https://regex101.com/)一切都很好。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(.))

我收到错误"XPath表达式不正确"。

当我从regex前瞻部分删除时，我可以使用它。

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

Orbeon Forms是否支持regex前瞻性？Regex前瞻：https://www.regular-expressions.info/lookaround.html

Answer 1

在不进行前瞻的情况下重新编写表达式。它匹配不超过6位的字符串。

使用

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

查看验证

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