addBefore method
Adds a String
before the first match of the pattern
. The pattern
should not be null
.
If there is no match, the String
is returned unchanged.
Example
String test = 'hello brother what a day today';
String afterString = test.addBefore('brother', 'big '); // returns 'hello big brother what a day today';
Implementation
String? addBefore(String pattern, String adition) {
if (this.isBlank) {
return this;
}
if (!this!.contains(pattern)) {
return this;
}
List<String> patternWords = pattern.split(' ');
if (patternWords.isEmpty) {
return '';
}
int indexOfFirstPatternWord = this!.indexOf(patternWords.first);
if (patternWords.last.length == 0) {
return '';
}
return this!.substring(0, indexOfFirstPatternWord) +
adition +
this!.substring(
indexOfFirstPatternWord,
this!.length,
);
}