how to slice a string in dart

Question

1

 var userQuestion = '10+5-√x+96';

2

 var userQuestion = '10+5-√x+96-√x-2+√x';

i am expecting to get the value between square root and the next operator in the string and grouping them into different strings

how can i slice the string √x if i don't know it's index in dart.

and make other strings with respect to the number of √x in the string

eg in 1 i want a string slice that will create

var squareRoot = '√x';

and in 2 i want to get something like this

var squareRoot = '√x';
var squareRoot1 = '√x';
var squareRoot2 = '√x';

you want to extract all √x from string?

eamirho3ein
– eamirho3ein

2022-12-07 12:06:36 +00:00
Commented Dec 7, 2022 at 12:06 — eamirho3ein
– eamirho3ein, Commented Dec 7, 2022 at 12:06

Robert Sandberg · Accepted Answer · 2022-12-07 12:13:00Z

1

If you want all the squareroots including whatever comes after, until you hit an operator, then this should do the trick:

var userQuestion = '10+5-√x+96-√y-2+√5/√123*√256';
var regexp = RegExp(r'(√[\w\d]+)[+\-*/]?');
var matches = regexp.allMatches(userQuestion);
var squareRoots = matches.map((e) => e.group(1)).toList();
print(squareRoots);

Will print:

[√x, √y, √5, √123, √256]

There is obviously no way to declare variables with names as you did if it is an unknown number of square roots, so you'll have to use a List<String> that hold your strings, as I did above.

answered Dec 7, 2022 at 12:13

Robert Sandberg

8,8332 gold badges19 silver badges37 bronze badges

Sign up to request clarification or add additional context in comments.

Collectives™ on Stack Overflow

how to slice a string in dart

1 Answer 1

Comments

Your Answer

Hot Network Questions

Collectives™ on Stack Overflow

1 Answer 1

Comments

Your Answer

Sign up or log in

Post as a guest

Related