regex,html5 , Regex not working in HTML5 pattern


Regex not working in HTML5 pattern

Question:

Tag: regex,html5

So I have this regex intended to let pass all text but those that contain as initial chars the "34" sequence:

^(?!34)(?=([\w]+))

The regex is working fine for me in https://regex101.com/r/iN1yN3/2 , check the tests to see the intended behavior.

Any Idea why it isn't working in my form?

<form>
    <input pattern="^(?!34)(?=([\w]+))" type="text">
    
        <button type="submit">Submit!</button>
</form>


Answer:

The pattern attribute has to match the entire string. Assertions check for a match, but do not count towards the total match length. Changing the second assertion to \w+ will make the pattern match the entire string.

You can also skip the implied ^, leaving you with just:

<input pattern="(?!34)\w+" type="text">

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