Elasticsearch, dealing with null values in date field

Question

I have the following string.

 MUST  (key1=value1)(key2>value2)NOT (key3=value3) SHOULD  (key4=value4)

And I need to split it into three strings.

MUST(key1=value1)(key2>value2)
NOT(key3=value3)
SHOULD(key4=value4)

Some statements, for example, NOT or SHOULD could be absent. So, I must match the end of the line also.

For now, I came up with a regex like this /(MUST)?.*(?=NOT)/

But it doesn't work if SHOULD is before NOT or there is only MUST. How can I add OR operator here, something like (?=NOT|SHOULD|$)

Tim Pietzcker · Accepted Answer · 2016-02-14 18:35:56Z

1

How about matching each part that starts with one of the keywords until the next keyword (or end of string):

\b(?:MUST|NOT|SHOULD)\b(?:(?!\b(?:MUST|NOT|SHOULD)\b).)*

Test it live on regex101.com.

Explanation:

\b(?:MUST|NOT|SHOULD)\b       # Match one of the keywords
(?:                           # Start of non-capturing group:
 (?!\b(?:MUST|NOT|SHOULD)\b)  # Unless we're at the start of another keyword:
 .                            # Match any character
)*                            # Repeat as often as possible

answered Feb 14, 2016 at 18:35

Tim Pietzcker

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1 Comment

srgbnd Over a year ago

It works! Thank you. I voted your answer. The vote will be visible when I have enough reputation.

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