Question 190997 in Flutter Question posted in
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Why is this Flutter FilteringTextInputFormatter regex not working?

On a Flutter TextField I have the following FilteringTextInputFormatter:

FilteringTextInputFormatter.allow(RegExp(r"^d+.?d{1,2}"));

It tries to match a decimal number up to two places, but I can’t input any numbers into the TextField.

https://regexr.com/7fpho

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3

Answers


  1. Chosen as BEST ANSWER
    0

    After messing with RegExr, I found that what I wanted was:

    RegExp(r"^d{1,4}(.d{0,2})?")

    This expression allows four digits with two decimal places.


  2. 0

    Do not filter based on a regex that targets the entire string when finished. Remember that to type "hello world", at some point you must type "hello" and a single space, so your regex that demands no space at the end will fail in a filter.

    Instead, use a regex match in the final validation. Not in the filter.

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  3. 0

    Try this

                                        TextField(
                                      keyboardType: const TextInputType
                                          .numberWithOptions(
                                        decimal: true,
                                      ),
                                      inputFormatters: [
                                        FilteringTextInputFormatter.allow(
                                          RegExp(r'^d*.?d{0,2}'),
                                        ),
                                      ],
                                    ),
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