I use this pattern in input tag type password to accept a strong password. "Must contain at least one number, one uppercase and lowercase letter, and one special character ,minimum of 8 characters, and maximum of 26 characters". But when I inserted one of these characters <>,./'"; the field title keep appearing. I would like to implement all special characters in my registration form
<form>
<input pattern="^(?=.*[a-z])(?=.*[A-Z])(?=.*\d)(?=.*[#$!%*?&])[A-Za-z\d#$!%*?&]{8,}$" />
<input type="submit" />
</form>
(?=.*[0-9]) require one digit anywhere
(?=.*[a-z]) require one lowercase letter anywhere
(?=.*[A-Z]) require one uppercase letter anywhere
(?=.*[^0-9a-zA-Z]) require one symbol anywhere
^.{8,26}$ match any string of 8 to 26 characters
Combine all of these together and you get:
^(?=.*[0-9])(?=.*[a-z])(?=.*[A-Z])(?=.*[^0-9a-zA-Z]).{8,26}$
This, of course, counts anything that isn't a letter from A to Z or a digit as a special character, including accented letters, letters from other alphabets, and whitespace.
Related
i'm not good in html pattern validation.
I have this problem, my input text is valid only : min 3 max 30 chars,
white space at first and at end of the string is not allowed, is allowed white space between one word and another is allowed, is allowed A-Za-z, first char of word it must be Uppercase and the others word it must be Lowercase.
Thanks.
--UPDATE--
input#name
Valid Examples:
'Mario Giovanni'
'Maria'
'Jacopo Karol Pio'
'Jacopo K'
Invalid Examples:
' Mario Giovanni'
'Mario Giovanni '
' Mario Giovanni '
'Mario Giovanni'
'maria'
'mAria'
'Antonio mario'
If you need pure regex then this should work for you:
<input type="text" pattern="(?=^.{3,30}$)^[A-Z][a-z]*(?: [a-z]+)*$">
(?=^.{3,30}$) - use a positive lookahead to make sure we have between 3 and 30 chars
^[A-Z] - require start with a capital letter
[a-z]* - optionally allow lowercase letters to follow
(?: [a-z]+)* - optionally allow a repeating group of a space char follow by one or more letters
$ - end of string anchor
You will want to use a Regular Expression pattern to check whether the input is valid or not, as well as the maxlength and minlength attributes to ensure that the input is between 3 and 30 characters.
Regarding the RegEx pattern, we must:
Start at the beginning of the input: ^
Verify that the first character is between A and Z: [A-Z]
Verify that the following characters before the last one are lowercase letters or spaces: [a-z ]*, where * indicates that there might be multiple characters matching that part of the pattern; if you only want to allow one space between word, then use ([a-z]* ?)
Verify that the last character is a lowercase letter: [a-z]$, where $ indicates the end of the input
Below is the code I would use.
<input type="text" minlength=3 maxlength=30 pattern="^[A-Z][a-z ]*[a-z]$">
Looks like what you wait is:
<input type="text" pattern="(?=^.{3,30}$)^[A-Z][a-z]+( [A-Z][a-z]+)*$">
Notice this is being validated in the user browser, and doesn't configure a secure input validation. You should check the input again at server-side before using it anywhere.
I have field "first and second name" and I need RegEx for capitalizing first letter in each word in this field.
With this pattern, only first word is capitalized, but second is not
<form action="/action_page.php">
First and Second name <input type="text" name="f_and_s_name" pattern="[A-zA-Z]{1,13}" title="">
<input type="submit">
</form>
The pattern="[A-zA-Z]{1,13}" pattern is parsed by the JS RegExp engine as ^(?:[A-zA-Z]{1,13})$. It matches a string that consists of 1 to 13 characters that are ASCII letters, and also [, \, ], ^, _, ` (see this answer for more details).
You plan to only validate strings that start with an uppercase ASCII letter followed with lowercase letters, then have a space, and then again an uppercase ASCII letter followed with lowercase letters.
Then, you may use
pattern="[A-Z][a-z]* [A-Z][a-z]*"
If you want to make the rule a bit less restricted, you may use [A-Z][a-zA-Z]*\s+[A-Z][a-zA-Z]* (this will also allow strings in ALLCAPS, and will allow any 1+ whitespace chars between two letter strings. If you plan to implement Unicode letter support, it will only be easy in latest Chrome versions (it will look like pattern="\p{Lu}\p{L}*\s+\p{Lu}\p{L}*"). However, it won't work in all other browsers that still do not support ECMA2018 standard.
What is the correct pattern for a text input to only allow uppercase letters, lowercase letters, and commas?
I know that this is correct for the letters:
pattern="[a-zA-Z]"
but I dont know how to allow commas.
Thanks for any help!
Short answer:
pattern="^[a-zA-Z,]*$"
A couple of comment:
* means zero or more characters which means this patter will allow empty fields as well. If you want to guarantee that it will contain at least one character, use + instead of *.
^ means beginning of the string and $ is the end. If you don't use them then something like this would be possible "!#123asdSDADS,,,21312312(2"
This question already has answers here:
Regex to match only letters
(20 answers)
Closed 8 years ago.
I'm trying to create a regex for a HTML5 input so a user can only insert alpha characters that may be in a name. So characters from a-z, but also including ö,ü,â,æ ... and so on whilst also allowing whitespace and hyphens .
I have played around with some pattens but nothing seems to work correctly, this is what I have so far: <input type="text" name="firstname" pattern="[a-zA-Z\x7f-\xff] " title="">
Does anyone have a quick answer for this?
Since the HTML5 pattern attribute uses the same regex syntax as JavaScript, there is no simple way to refer to all alphabetic characters. You would need to write a rather huge expression (and to update it as new alphabetic characters are added to Unicode). You would need to start from the Unicode character database and the definition of General Category of characters there, or rely on someone having done that for you.
However, for your practical purposes, testing for “alpha characters that may be in a name” is even more complex. There are non-alphabetic characters used in names, such as left single quotation mark (‘) in addition to normal quotation mark (’), and who knows what characters there might be? If this is about people’s real names, it is very difficult to impose restrictions that do not discriminate. If this is about user names in a system, for example, you can define the repertoire as you like, but [a-zA-Z\x7f-\xff] does not look adequate (it includes some control characters and some non-alphabetic characters and excludes many Latin letters commonly used in Europe).
There is a very simple method to apply all you RegEx logic(that one can apply easily in English) for any Language using Unicode.
For matching a range of Unicode Characters like all Alphabets [A-Za-z] we can use
[\u0041-\u005A] where \u0041 is Hex-Code for A and \u005A is Hex Code for Z
'matchCAPS leTTer'.match(/[\u0041-\u005A]+/g)
//output ["CAPS", "TT"]
In the same way we can use other Unicode characters or their equivalent Hex-Code according to their Hexadecimal Order (eg: \u0100–\u017FF) provided by unicode.org
Try: [À-ž] as an example of Range. Modify your Range according to your requirement.
It will match all characters between À and ž.
Sample regEx would be
/[A-Za-zÀ-ž\-\s]+/
For more Ref: Latin Unicode Character
My questions are simple:
Is the following valid? If it is, would it break in some browsers?
<div data-text="Blah blah blah
More blah
And just a little extra blah to finish"> ... </div>
Which characters "must" be encoded in attribute values? I know " should be ", but are any others required to be encoded?
Is the following valid?
It's a valid fragment of HTML5, yes.
would it break in some browsers?
Unlikely.
Which characters "must" be encoded in attribute values? I know " should be ", but are any others required to be encoded?
That depends on whether the attribute value is double quoted, single quoted or unquoted.
For the double quoted form " must be replaced by its character reference, and & may need to be replaced by its character reference depending on the characters that follow it. See attribute-value-double-quoted-state
For the single quoted form ' must be replaced by its character reference, and & may need to be replaced by its character reference depending on the characters that follow it. See attribute-value-single-quoted-state
For the unquoted form TAB, LINEFEED, FORMFEED, SPACE, > must be replaced by their character references, and & may need to be replaced by its character reference depending on the characters that follow it. See attribute-value-unquoted-state
HTML 5 spec
There are different requirements for different attributes so there isn't one answer.
For instance, title attributes allow lines feeds, but a class attribute is a space seperated line of string tokens.
For data elements though the spec says of the namespace:
contains no characters in the range U+0041 to U+005A (LATIN CAPITAL LETTER A to LATIN CAPITAL LETTER Z).
Other than that, it doesn't make any distinctions.