CODEWITHSUNDEEP
javascriptjqueryregex
rawan mansour
rawan mansour

Reputation: 79

Prevent 2 Consecutive numbers regular expression

I am trying to validate text input in JavaScript to prevent 2 consecutive numbers. ex:

name2aaa accept

name22aa not accept

I am using the validation on text input. And that's my code, it's already contains prevent @ sign, I want to add the prevent 2 consecutive numbers rule to the same regex

 $('#storename').on('input', function () {
    var c = this.selectionStart,
        r = /[\\\@@]/g,
        v = $(this).val();
    if (r.test(v)) {
        $(this).val(v.replace(r, ''));
        c--;
    }
    this.setSelectionRange(c, c);
});

Upvotes: 0

Views: 418

Answers (1)

Hao Wu
Hao Wu

Reputation: 20669

This is probably what you need:

regex

[\\@]|(\d)\d+
  • [\\@]: \ or @
  • |: or
  • (\d)\d+: a digit with 1 or more digits ahead, put the first digit in group 1

substitution

$1

Assuming you don't want user to type another digit if there's already a digit before it.

When user tries to type 42, it stores 4 in the group, and replace all the digits with that group. In this case, 42 -> 4. So users can no longer type more than 1 digit in a row.

$('#storename').on('input', function () {
    var c = this.selectionStart,
        r = /[\\@]|(\d)\d+/g,
        v = $(this).val();
    if (r.test(v)) {
        $(this).val(v.replace(r, '$1'));
        c--;
    }
    this.setSelectionRange(c, c);
});
<script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/3.3.1/jquery.min.js"></script>
<input id="storename" />

Upvotes: 1

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