What is "/[a-z]/" in js??

Answer 1

Sina Dont worry... Read they and if you dont understand something ask

Answer 2

I don 't know much about javascript but this seems to work:
function a(){
var x = document.getElementById("in")
if(/[a-b]/g.exec(x.value) != null){
alert("you enterd s.th between a-b")
}
}

Answer 3

Its an regex (regular expression) object that allow you to define a pattern (in this case an character from a to z lowercase)

https://www.w3schools.com/Jsref/jsref_obj_regexp.asp

Answer 4

Thank you so much

Answer 5

I saw the w3schools examples could you plz write for me more e.g??

Answer 6

Can you write a code with both of them plz? if you could thanks

Answer 7

Sina You have to be more clear on what you want get... If you want check if a string contain the pattern "s.th" (without quotes) you can do it with String.indexOf method also while with pattern you have to make your function "a" like:

function a(){
var x = document.getElementById("in").value
if( /s\.th/.test(x)){
alert("you enterd s.th between a-b")
}
}

Note that a String ITS DIFFERENT from a RegExpr:

"I am a string"

/I am a RegExpr/

Note start/end delimitator... Futhermore i have posted links because explain RegExpr its not simple above all in a comment... Please read these resources and post if you dont understand some concept

Answer 8

I'm so sorry becuse I saw your links now

Answer 9

How can I make s.th like this that works true

https://code.sololearn.com/WW92AUsdxu4z/?ref=app

Answer 10

# Below describe a pattern that atary with an lowecase alpha letter and follow least one alpha numeric (lowercase or uppercase) or underscore
/^[a-z][a-zA-Z0-9_]+/

# Below describe a pattern that must match or "i am" or "you are" followed by " good"
/(i am|you are) good/

https://developer.mozilla.org/en-US/docs/Web/JavaScript/Guide/Regular_Expressions

Answer 11

Sorry but what you dont understand? I have posted two links for make you read futhermore and while i can post other example i think that online resources make this much better than me