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How to form a regex for a double quote that may or may not exist (Flutter)?

How to form a regex for a double quote that may or may not exist (Flutter)

It's possible that I will either have

boundary=-------Embt-Boundary--1261032946D275CF

boundary="-------Embt-Boundary--1261032946D275CF"

and I want to just extract -------Embt-Boundary--1261032946D275CF from the String.

How should I formed the regex? I have tried boundary="?(.+)("?) but it only works for the first but for the second I'll get the last double quote in my extracted string (eg. -------Embt-Boundary--1261032946D275CF").

Solution:

I believe flutter is Dart, which uses JavaScript regex specification, yes? Use capture groups in this way:

boundary=("?)(.*)(\1)

Group 1 will capture a quote if there is one. Group 2 will capture your desired result. Then, \1 will match the quote, if there was one, or nothing, if the quote was not present.

regex101

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