Replace HTML tags through regular expression using dart language

Question

How should we replace <br /> html tags with line feed '\n' using RegExp in dart?

Input:

one<br />two<br />three

Output:

one
two
three

Why do you need a regular expression? A simple search-and-replace action seems to be sufficient. Unless you need to handle variable amounts of whitespace, then <br\s*/> would be a useful search regex. — Tim Pietzcker
– Tim Pietzcker, Commented Jul 13, 2022 at 13:49

lrn · Accepted Answer · 2022-07-13 15:00:04Z

1

final _brRe = RegExp(r"<br\s*/>");
String replaceBreaks(String input) =>
    input.replaceAll(_brRe, "\n");

You create a RegExp using the RegExp constructor, remembering to always use a raw string literal, so you don't need to double-escape backslashes.

Then you just use String.replaceAll to replace all substrings matched by the RegExp with a newline.

answered Jul 13, 2022 at 15:00

lrn

72.9k7 gold badges122 silver badges141 bronze badges

Sign up to request clarification or add additional context in comments.

2 Comments

Piyush Over a year ago

With this, problem is middle one is getting missed out.... Input: One<br />two<br />three. Output: one\nthree

lrn Over a year ago

When I run the code, it correctly replaces both <br />s with newlines, and retains the One, two and three strings. Check: dartpad.dev/?id=a6b1cb1898e0aaa38ddb78a226790a34 . You must be doing something differently. Are you, by any chance, changing the regexp to r"<br.*/>"?

Collectives™ on Stack Overflow

Replace HTML tags through regular expression using dart language

1 Answer 1

2 Comments

Your Answer

Hot Network Questions

Collectives™ on Stack Overflow

1 Answer 1

2 Comments

Your Answer

Sign up or log in

Post as a guest

Related