Regex pattern for key and value in Kotlin - regex

Question

I am try to split this String into key value pattern using regex
val x = "title=MyTitle, active=true, title2=MyTitle, Subtitle, new=false, title3=My Title#subtitle1"
I try using this formula
([\w]+)=(.*?)([\w]+)
the output is
title=MyTitle
active=true
title2=MyTitle
new=false
title3=My
Any clue to modified regex formula so the output become
title=MyTitle
active=true
title2=MyTitle, Subtitle
new=false
title3=My Title#subtitle1

Answer 1

A look-ahead works pretty well
(\w+)=(.*?(?=,\s*\w+=|\s*$))
Breakdown
( # group 1 (key)
\w+ # word characters
) # end group 1
= # equals sign
( # group 2 (value)
.*? # anything, non-greedy
(?= # look-ahead ("followed by")...
,\s* # comma and spaces
\w+= # word characters and an equals sign (the next key)
| # or
\s*$ # spaces and the end of string
) # end look-ahead
) # end group 2

Answer 2

You might use 2 capturing groups.
In the first group capture 1+ word chars. In the second group capture the words asserting what is on the right is not a whitespace char followed by a word and an equals sign.
(\w+)=([\w+,]+(?:(?!\s\w+=)\s[#\w]+)*)(?:,|$)
(\w+) Capture group 1, match 1+ word chars
= Match =
( Capture group 2
[\w+,]+ Match 1+ word chars or ,
(?: Non capturing group
(?!\s\w+=) Assert what is on the right is not a whitespace, 1+ word chars and =
\s[#\w]+ Match a whitespace and 1+ word chars or #
)* Close group and repeat 0+ times
) Close group 1
(?:,|$) Match either , or assert the end of the string
Regex demo
Or you might use a broader match for the value part using a negated character class instead of matching the specified characters.
(\w+)=([^=\s]+(?:(?!\s\w+=)\s[^=\s,]+)*)(?:,|$)
Regex demo