Email Validation (React Native). Returning the result as 'invalid' for all the entries

Ok I got the code working, below you can take the look for validating the email on each user input :

1. Your function part:

validate = (text) => {
  console.log(text);
  let reg = /^\w+([\.-]?\w+)*@\w+([\.-]?\w+)*(\.\w{2,3})+$/;
  if (reg.test(text) === false) {
    console.log("Email is Not Correct");
    this.setState({ email: text })
    return false;
  }
  else {
    this.setState({ email: text })
    console.log("Email is Correct");
  }
}

2. You TextInput Component:

<TextInput
  placeholder="Email ID"
  onChangeText={(text) => this.validate(text)}
  value={this.state.email}
/>

Looks like a syntax error. You've got a nested function called validate directly inside the definition for go.

As a general rule I would suggest to keep your indentation and curly-brackets consistent so these sort of errors are detectable at a glance-- when the brackets don't line up there's a problem.

Then, there's a few things you might do to get this code working:

• Remove the validate (email) line along with its accompanying close bracket
• Reference email via this.state.email in go
• Add an additional state variable to indicate if the email has been validated or not.

Something like:

this.state = {
 email :'',
 validated : false,
}

And...

go = () => {  
        if (this.state.email.test(/^\w+([\.-]?\w+)*@\w+([\.-]?\w+)*(\.\w{2,3})+$/)==0) {
            this.setState({ validated : true });
        } else {
            this.setState({ validated : false });
        }
    }