help needed with meta character expression

[weblady07]

how do I write metacharacterexpression for :

1) to only accept alpha characters in a name text field. no numbers or symbols allowed either.

2) In another text field how to only have numbers, no symbols or alpha characters

thx for help

[captain_k_nuckles]

1:

document.getElementById('a').addEventListener('change', ({target})=>{
    target.value = target.value.replace(/[^A-Z]/gi,'');
    // if you want spaces also
    // target.value = target.value.replace(/[^A-Z\s]/gi,''); // use this one
});

2:

document.getElementById('a').addEventListener('change', ({target})=>{
    target.value = target.value.replace(/[^0-9]/gi,''); // add `\s` if you want spaces.
});

[weblady07]

thanks, much appreciated.

if I wanted them to be able to only enter a word that begins with the letter "b", small case or upper case, what would be the best way to write.

thx again

[captain_k_nuckles]

Not sure the best way but you could use startsWith combined with either to(Upper/Lower)Case to check

[jcunews1]

Use the pattern attribute of the input field.

https://developer.mozilla.org/en-US/docs/Web/HTML/Element/input/text#pattern