Split str. using regex, incl. delimiters

Programming
,
1

I would like to split a string using a regular expression in Dart, and include the matching delimiters in the resulting list. For example, the string 123.456.789 should result in [ 123, ., 456, ., 789 ].

The behaviour of split in languages like C#, JavaScript, Python and Perl can be achieved by including the delimiters in capturing parentheses. However, this doesn’t seem to work in Dart.

The following regex can be used to split a string with single delimiter, with lookbehind and lookahead: ((?<=\.)|(?=\.)). For multiple delimiters, the regex should be ((?<=\.|;)|(?=\.|;)).

print("123.456.789;abc;.xyz.;ABC".split(new RegExp(r"((?<=\.|;)|(?=\.|;))")));

This yields [ 123, ., 456, ., 789, ;, abc, ;, ., xyz, ., ;, ABC ].

2 
print("123.456.789".split(new RegExp(r"((?<=\.)|(?=\."))")));

This will output [ 123, ., 456, ., 789 ].