CODEWITHSUNDEEP
regex
Srdjan M.
Srdjan M.

Reputation: 3405

Regex - check if exist but don't include it

Text:

Name=Jennifer,Age=29,Height=1.70,Occupation=Actress...

Regex:

(?<Name>(?:Name=)\w+)?\,?(?<Age>(?:Age=)\d+)?\,?(?<Height>(?:Height=)[\d.]+)?\,?(?<Occupation>(?:Occupation=)\w+)?\,?

Result:

Full match  `Name=Jennifer,Age=29,Height=1.70,Occupation=Actress`
Group `Name`    `Name=Jennifer`
Group `Age` `Age=29`
Group `Height`  `Height=1.70`
Group `Occupation`  `Occupation=Actress`

How to make keys not part of the group, but check if they exist?

Upvotes: 1

Views: 230

Answers (1)

Wiktor Stribiżew
Wiktor Stribiżew

Reputation: 626794

Generally, it is a bad idea to use a regex that only consists of optional patterns (because you need to handle empty matches, the patterns only match in a predefined order, and it is not possible to make it work with positive lookaheads since all are optional). It will make more sense to just use Name=(\w+), Age=(\d+) like regexes to extract all the necessary details.

If you want to follow your path, you may try fixing your pattern by putting the keys outside the capturing groups:

(?:Name=(?<Name>\w+))?,?(?:Age=(?<Age>\d+))?,?(?:Height=(?<Height>[\d.]+))?,?(?:Occupation=(?<Occupation>\w+))?,?

See the regex demo

enter image description here

Upvotes: 1

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