using a pattern in html input for just numbers and N/A

Question

Struggling to get the correct formatting for a regex which will accept any number or N/A any other value would fail validation. The following did not work. My regex is less than average...

<input type="text" record="job" name="quote_design_hours" size="6" pattern="[0-9|N/A]" title="Value must be a number or N/A" value="">

Damiano · Accepted Answer · 2017-10-26 16:55:57Z

1

Your pattern should be (N/A|[0-9]+)

Here is an example in action

The reasoning is:

value should match one of two expressions so you use OR operator | (you can use non-matching groups with (?: ... | ... ) instead
first expression is literally N/A
second expression is any digit [0-9] (i.e. any character from 0 to 9), and can be present one or more times (+)

edited Oct 26, 2017 at 16:55

answered Oct 26, 2017 at 16:36

Damiano

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3 Comments

Jan Over a year ago

They are anchored by default.

Wiktor Stribiżew Over a year ago

Right, N/A|[0-9]+ will do. pattern="^(N/A|[0-9]+)$" will be translated into ^(?:^(N/A|[0-9]+)$)$ pattern. It will also work, but it is rather redundant.

Damiano Over a year ago

Thanks, I edited my comment, I wasn't aware of this detail

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