description

# replaceAllMapped method Null safety

String replaceAllMapped (

1. Pattern from,
2. String replace(
   1. Match match
   )

)

Replace all substrings that match `from` by a string computed from the match.

Returns a new string in which the non-overlapping substrings that match `from` (the ones iterated by `from.allMatches(thisString)`) are replaced by the result of calling `replace` on the corresponding Match object.

This can be used to replace matches with new content that depends on the match, unlike replaceAll where the replacement string is always the same.

The `replace` function is called with the Match generated by the pattern, and its result is used as replacement.

The function defined below converts each word in a string to simplified 'pig latin' using replaceAllMapped:

    pigLatin(String words) => words.replaceAllMapped(
        new RegExp(r'\b(\w*?)([aeiou]\w*)', caseSensitive: false),
        (Match m) => "${m[2]}${m[1]}${m[1].isEmpty ? 'way' : 'ay'}");

    pigLatin('I have a secret now!'); // 'Iway avehay away ecretsay ownay!'

## Implementation

    String replaceAllMapped(Pattern from, String Function(Match match) replace);