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[英]Adding removing leading and trailing spaces in this JavaScript RegEx
[英]Regex to not match leading and trailing white spaces for email address in javascript
目前,我使用這個 email 正則表達式:
/^[a-zA-Z0-9._%+-]+@[a-z0-9.-]+\.[a-z]{2,4}$/
我嘗試驗證 email,如下所示:
if (!event.target.value.match(/^[a-zA-Z0-9._%+-]+@[a-z0-9.-]+\.[a-z]{2,4}$/)) {
setEmailStatus('Enter valid email address');
}
但是當使用尾隨和前導空格輸入時,它不會引發任何錯誤。 例如hello@gmail.com
如何驗證上述正則表達式的空格?
這是完整的代碼:
const [ usernamevalues, setUsername ] = React.useState({ username: '' });
const [ emailvalues, setEmail ] = React.useState({ email: '' });
const [ usernameStatus, setUsernameStatus ] = React.useState('');
const [ emailStatus, setEmailStatus ] = React.useState('');
const handleChangeEmail = (prop) => (event) => {
event.preventDefault();
if (event.target.value.length === 0) {
setEmailStatus('This field is required');
} else if (!event.target.value.match(/^[a-zA-Z0-9._%+-]+@[a-z0-9.-]+\.[a-z]{2,4}$/)) {
setEmailStatus('Enter valid email address');
} else {
setEmailStatus('');
}
/*if (validator.isEmpty(event.target.value)) {
setEmailStatus('This field is required');
}*/
setEmail({ ...emailvalues, [prop]: event.target.value });
};
根據錯誤,我正在嘗試啟用提交按鈕。 我正在為上述字段維護 state。
let isEnabled = usernamevalues.username !== '' && usernamevalues.username.length >= 1
&& emailvalues.email !== '' && usernameStatus !== 'This field is required' && usernameStatus !== 'Enter valid username'
&& emailStatus !== 'This field is required' && emailStatus !== 'Enter valid email address'
<TextField
label='Email'
id='outlined-margin-normal'
placeholder='Email'
value={emailvalues.email}
type='email'
className={classes.textField}
margin='normal'
variant='outlined'
onChange={handleChangeEmail('email')}
InputLabelProps={{
classes: {
root: classes.cssLabel,
focused: classes.cssFocused
}
}}
InputProps={{
endAdornment: (
<InputAdornment position='end'>
<EmailOutlinedIcon htmlColor='#1C5FAB' opacity={0.5} />
</InputAdornment>
),
classes: {
root: classes.cssOutlinedainput,
focused: classes.cssFocused,
notchedOutline: classes.notchedOutline,
input: classes.input
}
}}
error={emailStatus ? emailStatus : ''}
helperText={emailStatus !== '' ? emailStatus : null}
/>
<Typography className={classes.error}>{error}</Typography>
<Button
variant='outlined'
className={classes.button}
onClick={handleSubmit}
disabled={!isEnabled}
style={{ backgroundColor: isEnabled ? '#1c60ab' : '#DCE2EB'}}
>
Submit
</Button>
你不需要正則表達式。 使用trim()
( 文檔)
使用您的示例:
if (!event.target.value.trim().match(/^[a-zA-Z0-9._%+-]+@[a-z0-9.-]+\.[a-z]{2,4}$/)) {
setEmailStatus('Enter valid email address');
}
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