How to extract number only from string in flutter?

Question

Lets say that I have a string:

a="23questions"; b="2questions3";

Now I need to parse 23 from both string. How do I extract that number or any number from a string value?

Hashir Baig · Accepted Answer · 2020-04-24 05:45:04Z

99

The following code can extract the number:

aStr = a.replaceAll(new RegExp(r'[^0-9]'),''); // '23'

You can parse it into integer using:

aInt = int.parse(aStr);

answered Apr 24, 2020 at 5:45

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1 Comment

Single Line version: int intValue = int.parse(myString.replaceAll(RegExp('[^0-9]'), ''));

user321553125 · Accepted Answer · 2020-04-24 05:54:11Z

const text = "23questions";

Step 1: Find matches using regex:

final intInStr = RegExp(r'\d+');

Step 2: Do whatever you want with the result:

void main() { print(intInStr.allMatches(text).map((m) => m.group(0))); }

Thanks. It works but I feel like above solution will suffice and would be cleaner.