CODEWITHSUNDEEP
regexibm-watsonwatson-assistant
dgalan
dgalan

Reputation: 79

Error in pattern in Watson Assistant Entity

I am trying to make a regex pattern for a Watson Assistant Entity that detects dates similar to those in bold:

I have used the following expression to do it:

( \b(?:3[01]|[12][0-9]|0?[1-9])([\-/.])(1[1-2]|0?[1-9])(?![\-/.])\b )

This expression works well, the problem is that the pattern comparison engine that is used in Watson, has syntax limitations.

Entity patterns cannot contain:

At this point, I cannot use (?![-/.]) to avoid dates like '25/02/2020'.

How can I do it?

Thanks in advance,

Upvotes: 0

Views: 270

Answers (3)

Simon O'Doherty
Simon O'Doherty

Reputation: 9357

First this way may only work in the US (I tried it with a different $timezone but didn't work, but it could be a "try it out" issue).

Switch on @sys-date. If you user says "date 02/18 of" it will pick up 02/18 as 2020-02-18. You can then work with the date easier.

The other approach is to create a cloud function to do the complex regex for you and hand it back to Watson Assistant.

Upvotes: 1

virolino
virolino

Reputation: 2227

I do not have Watson Assistant Entity for testing, but this should work:

\s\d?\/\d?\s

or

\s\d{1,2)\/\d{1,2}\s

or

\s(\d|\d\d)\/(\d|\d\d)\s

where \s is white space, and \d is any digit

The site does not provide a proper manual with the abilities of the regex engine (at least, I did not find it). So I provided work-arounds for the said limitations.

It does not validate that the dates are realistic, but since 30/2 (February 30) is a valid match, there should be no problem.

Upvotes: 0

Julio
Julio

Reputation: 5308

You may try with this:

[ ]((?:3[01]|[12][0-9]|0?[1-9])([\-/.])(1[1-2]|0?[1-9]))(?:$|[^\d\-/.])

I'm assuming you need the different capturing groups you used on your question. If that's not the case, you may remove them or replace them with non-capturing groups (?:)

I'm also assuming you don't need to capture the space on the capturing group, so I put it aside.

So the basic idea is that before your expression you may want to find either end of string/line $ or some character that is not number, -, / or ..

Upvotes: 1

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