How to remove Letters AFTER-BEFORE specific Letters in dart-CodePudding

i found here many question about How to remove Letters AFTER specific Letters but did not find AFTER-BEFORE specific Letters

i don't know if it possible in dart ..

sample

String test = 'HelloAflutterBHello'

so how to outputs the following result

print(test) => 'flutter'

that's mean i want to delete everything before ('A') and everything after ('B')

i tried this

print(test.substring(0, test.indexOf('B')));

but this will delete only anything after ('B') but couldn't find a way to delete the Letters before ('A') too ..

i hope any good answer . thanks

CodePudding user response：

You can use regular expressions to do the job. This way you can check for more than one character. Consider this code:


void main() {
String test = 'HelloABCflutterDEFHello';

//regex match all characters between two (or more) specified characters
RegExp exp = RegExp(r"(?<=ABC).*(?=DEF)"); 

//store all results from searching within a string.
Iterable<RegExpMatch> matches = exp.allMatches(test);

// access the captured value
print(matches.first.group(0)); 
}