Regex for a name and number dart

I need to validate a form that a user provides their name and a number. I have a regex that is supposed to make sure the name contains only letters and nothing else and also for the number input i need to make sure only numbers are in the field.
The code I have looks like

validator: (value) => value.isEmpty
? 'Enter Your Name'
: RegExp(
'!@#<>?":_``~;|=-+)(*&^%1234567890')
? 'Enter a Valid Name'
: null,


can i get a regex expression that validates a name in such a way if any special character or number is inputted it becomes wrong meaning only letters are valid and another that validates a number in such a way if an alphabetical letter or any special character is inputted it becomes wrong meaning only the input of a number is valid

RegExp(r'[!@#<>?":_`~;[]\|=+)(*&^%0-9-]').hasMatch(value)

-

]

.hasMatch(value)

[0123456789]

[0-9]

0-9

s

r'[!@#<>?":_`~;[]\|=+)(*&^%s-]'

2 Answers
2

It seems to me you want

RegExp(r'[!@#<>?":_`~;[]\|=+)(*&^%0-9-]').hasMatch(value)


Note that you need to use a raw string literal, put - at the end and escape ] and chars inside the resulting character class, then check if there is a match with .hasMatch(value). Notre also that [0123456789] is equal to [0-9].

-

]

.hasMatch(value)

[0123456789]

[0-9]

As for the second pattern, you can remove the digit range from the regex (as you need to allow it) and add a s pattern (s matches any whitespace char) to disallow whitespace in the input:

s

s

RegExp(r'[!@#<>?":_`~;[]\|=+)(*&^%s-]').hasMatch(value)


Create a static final field for the RegExp to avoid creating a new instance every time a value is checked. Creating a RegExp is expensive.

static final RegExp nameRegExp = RegExp('[a-zA-Z]');
// or RegExp(r'pL'); // see https://stackoverflow.com/questions/3617797/regex-to-match-only-letters
static final RegExp numberRegExp = RegExp(r'd');


Then use it like

validator: (value) => value.isEmpty
? 'Enter Your Name'
: (nameRegExp.hasMatch(value)
? null
: 'Enter a Valid Name');


RegExp('[a-zA-Z ]')

true

By clicking "Post Your Answer", you acknowledge that you have read our updated terms of service, privacy policy and cookie policy, and that your continued use of the website is subject to these policies.