How do you check if a word contains a letter in javascript?
I have a page with a textbox where a user is supposed to enter a 24 character (letters and numbers, case insensitive) registration code. I used Show The registration codes are typically given as groups of characters separated by dashes, but I would like for the user to enter the codes without the dashes. How can I write my JavaScript code without jQuery to check that a given string that the user inputs does not contain dashes, or better yet, only contains alphanumeric characters?
Dov Miller 1,8685 gold badges34 silver badges44 bronze badges asked Dec 14, 2010 at 21:35
Vivian RiverVivian River 30.3k60 gold badges190 silver badges305 bronze badges 4 With ES6 MDN docs .includes()
E: Not suported by IE - instead you can use the Tilde opperator
Used with a number, the Tilde operator effective does
domster 5362 gold badges8 silver badges23 bronze badges
answered Jun 15, 2017 at 22:26
3 If you have the text in variable
This will test and make sure the user has entered at least one character, and has entered only alphanumeric characters. answered Dec 14, 2010 at 21:38
cdhowiecdhowie 149k23 gold badges278 silver badges290 bronze badges 0
check if string(word/sentence...) contains specific word/character
answered Apr 11, 2013 at 7:02
T.ToduaT.Todua 50.1k19 gold badges217 silver badges213 bronze badges 1 ES6 contains inbuilt method (
Following polyfill can be used to add this method in non-supported browsers. (Source)
answered Dec 3, 2017 at 9:55
Vipin KumarVipin Kumar 6,3231 gold badge17 silver badges25 bronze badges You're all thinking too hard. Just use a simple Regular Expression, it's your best friend.
Learn Regex in 5 minutes? answered Oct 3, 2014 at 14:44
Adam McArthurAdam McArthur 9201 gold badge13 silver badges25 bronze badges 5 Use a regular expression to accomplish this.
answered Dec 14, 2010 at 21:41
Gabriele PetrioliGabriele Petrioli 185k34 gold badges254 silver badges306 bronze badges 2 If you're searching for character(s) in the start or at the end of the string, you can also use
answered Jul 13, 2018 at 13:49
Ejaz KarimEjaz Karim 3,6466 gold badges36 silver badges49 bronze badges 0
To test for alphanumeric characters only:
The regex is testing for 1 or more (+) of the set of characters 0-9, A-Z, and a-z, starting with the beginning of input (^) and stopping with the end of input ($). answered Dec 14, 2010 at 21:45
fairfieldtfairfieldt 8411 gold badge6 silver badges10 bronze badges 0 Kevins answer is correct but it requires a "magic" number as follows:
In that case you need to know that -1 stands for not found. I think that a bit better version would be:
Taki 16.6k3 gold badges25 silver badges44 bronze badges answered Nov 9, 2015 at 9:43
1 Try this:
Here is an example: http://jsfiddle.net/oliverni/cb8xw/ answered Nov 28, 2013 at 21:01
Oliver NiOliver Ni 2,5387 gold badges30 silver badges43 bronze badges 0 String's search function is useful too. It searches for a character as well as a sub_string in a given string.
answered May 4, 2015 at 14:32
learner010learner010 3454 silver badges17 bronze badges If you are reading data from the DOM such as a p or h2 tag, for example, you will want to use two native JavaScript functions, it is quiet easy but limited to es6, at least for the solution I am going to provide. I will search all p tags within the DOM, if the text contains a "T" the entire paragraph will be removed. I hope this little example helps someone out! HTML
JS
answered Feb 2, 2019 at 1:24
0 Working perfectly.This exmple will help alot.
chriz 1,3332 gold badges16 silver badges32 bronze badges answered Aug 7, 2013 at 11:56
MankitaPMankitaP 571 gold badge1 silver badge7 bronze badges You can use
answered Feb 20 at 3:44
A sample regex pattern test you can use to find out if the string contains a character '@': /(@[A-Za-z])\w+/.test(str_text) answered Jun 21, 2021 at 14:16
shasi kanthshasi kanth 6,86324 gold badges107 silver badges156 bronze badges Check if string is alphanumeric or alphanumeric + some allowed chars The fastest alphanumeric method is likely as mentioned at: Best way to alphanumeric check in Javascript as it operates on number ranges directly. Then, to allow a few other extra chars sanely we can just put them in a I believe that this implementation will deal with surrogate pairs correctly correctly.
GitHub upstream. Tested in Node.js v10.15.1. answered Oct 12, 2019 at 22:30
It's worked to me!Attribute Contains Selector [name*=”value”]This is the most generous of the jQuery attribute selectors that match against a value. It will select an element if the selector's string appears anywhere within the element's attribute value. Compare this selector with the Attribute Contains Word selector (e.g. [attr~="word"]), which is more appropriate in many cases. source: Attribute Contains Selector [name*=”value”] => https://api.jquery.com/attribute-contains-selector/
answered Feb 12, 2021 at 1:51
1 The includes() method determines whether an array includes a certain value among its entries, returning true or false as appropriate.
know more answered Sep 2, 2021 at 21:04
Demonstration: The include() method finds the “contains” character in whole string, it will return a true.
answered Sep 2, 2019 at 10:48
DeveloperDeveloper 87010 silver badges6 bronze badges How do you check if a string contains a letter in JavaScript?To check if a string contains any letters, use the test() method with the following regular expression /[a-zA-Z]/ . The test method will return true if the string contains at least one letter and false otherwise. Copied!
How do you check if an element is a letter in JavaScript?To check if a character is a letter, call the test() method on the following regular expression - /^[a-zA-Z]+$/ . If the character is a letter, the test method will return true , otherwise false will be returned.
How do you check if a string contains a certain letter?Use the String. includes() method to check if a string contains a character, e.g. if (str. includes(char)) {} . The include() method will return true if the string contains the provided character, otherwise false is returned.
How do you check if a string contains a specific word JS?To check if a substring is contained in a JavaScript string:
Call the indexOf method on the string, passing it the substring as a parameter - string. indexOf(substring) Conditionally check if the returned value is not equal to -1. If the returned value is not equal to -1 , the string contains the substring.
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