I need a Regex pattern to restricted number in the Name Field input, I don't receive the name as like
12345678, 3241238215, 4323438,. Mean I don't need like this just mix text number.
not all put numbers without text.
<!-- Name -->
<div>
<x-label for="name" :value="__('Name')" />
<x-input id="name" class="block mt-1 w-full" type="text" name="name" pattern="<HERE!>" :value="old('name')" required autofocus />
</div>
I
".*[A-Za-z].*"
"." match any character
"*" match zero or more of the previous character
".*" match any string
[] match any one of the characters listed inside
A-Z match any thing between upper-case A and upper-case Z (all upper-case)
a-z match any thing between upper-case a and upper-case z (all lower-case)
[A-Za-z] match any alpha character
".*[A-Za-z].*" match an alpha char in any string
you could also use this cheatsheet: https://cheatography.com/davechild/cheat-sheets/regular-expressions/
Related
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.
im trying to force the user to input comma seperated words and reject any white space seperated words using the pattern attribute thats part of the HTML5 <input/> tag .
My following Expression expression doesn't work even though this says it does when I plug it in and test it.
My expression : ^((([a-zA-Z]\s*)+)\, ?(([a-zA-Z]\s*)+))$
<div class="col-md-6">
<input type="text" id="traits" name = "traits" class="form-control" placeholder = "crazy, hyper, outgoing" pattern="^((([a-zA-Z]\s*)+)\, ?(([a-zA-Z]\s*)+))$" required>
</div>
This allows only comma separated words:
^[a-zA-Z]+(,[a-zA-Z]+)*$
No spaces allowed, no more than one comma at a time, and commas should be only between words.
Demo
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.
Codepen example:
https://codepen.io/Trost/pen/KXBRbY
Try putting 1 symbol in both fields.
I can't get what's wrong. If I test these regex in https://regex101.com, they appear to be identical.
<form>
Works: <input type="text" name="country_code" pattern="[\d\s-]{3}" title="-23" required>
<input type="submit">
</form>
<form>
Bug: <input type="text" name="country_code" pattern="[\d-\s]{3}" title="- 3" required>
<input type="submit">
</form>
The real root cause here is that the regex [\d-\s] is used in the pattern HTML5 attribute, and in the latest versions of Chrome and FireFox is compiled as an ES2015-compatible regex with the u modifier. The consequence is that there are much stricter escaping rules for the Unicode regex patterns.
What it means is whenever a char cannot be parsed unambiguously, it is an error. When a char is escaped, but does not need escaping, it is again an error.
The chars that you may escape in the character class inside a u based regex are +, $, ^, *, (, ), |, \, [, ], ., ?, -, {, } (see this source). If the - is at the start/end of the character class, it still can go unescaped, as it can only be parsed as a literal hyphen there.
In between two shorthand character classes, an unescaped - will produce an error because it is treated as a user error.
So, either place a hyphen at the start/end (it is always the best option), or escape it inside the character class (and never escape it outside of the character class).
You define two different things:
[a-z] is a definition of a range - all characters from a to z.
[az-] is a definition of a set of three elements - a, z and
-.
Currently, I'm using one that I found with a length restriction:
<input #password="ngModel" type="password" name="password" minlength="5" maxlength="30" pattern="((?=.*\d)(?=.*[a-z])(?=.*[A-Z]).{6,20})" required ngModel>
It works, but I don't want the length restriction at the end. I don't know much about regular expressions, so I assumed that removing {6,20} at the end would get the job done, but I was wrong.
So my question is: How do I make this regex work without the length restriction? Thanks!
You are using an HTML5 pattern attribute that anchors a regex by default (it actually wraps the pattern with ^(?: and )$). That means the pattern must match the entire string. This is the reason why you can't just take out .{6,20} and keep the lookaheads.
You need to use the lookaheads at the beginning, and .* (to allow 0 or more chars in the input) or .+ (to disallow empty input) at the end (as the consuming pattern part):
pattern="(?=.*\d)(?=.*[a-z])(?=.*[A-Z]).*"
This will be successfully translated into /^(?:(?=.*\d)(?=.*[a-z])(?=.*[A-Z]).*)$/ and will work as expected:
^ - start of string
(?: - start of the non-capturing group
(?=.*\d) - 1 digit after any 0+ chars from the current position is required
(?=.*[a-z]) - 1 lowercase letter after any 0+ chars from the current position is required
(?=.*[A-Z]) - 1 uppercase letter after any 0+ chars from the current position is required
.* - any 0 or more chars
) - end of the non-capturing group
$ - end of string.