Javascript regex to match empty strings, non-digit characters or numbers with more than 1 digit?

Question

I'm trying to match empty strings, non-digit characters or numbers with more than 1 digit.

Examples:

"", "a", "abc", "10"

I tried:

/^([^1-9]*)|(\d{2,})$/

but it doesn't work.

@JosephSilber For some reason it also matches single digit numbers. — sudokai
– sudokai, Commented Jan 26, 2012 at 20:25

anubhava · Accepted Answer · 2012-01-26 20:18:49Z

2

You can use following regex for that:

/^(\d{2,}|[^\d]+|)$/

answered Jan 26, 2012 at 20:18

anubhava

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5 Comments

sudokai Over a year ago

Thanks! I still have some doubts though: /^(\d{2,}|[^\d]+|)$/ works, /^([^\d]*)|(\d{2,})$/ doesn't work, but /^(([^\d]*)|(\d{2,}))$/ works? Why?

anubhava Over a year ago

You do need to group all or conditions in a bracket that's why /^[^\d]*|\d{2,}$/ didn't work for you but /^([^\d]*|\d{2,})$/ did.

MrFox Over a year ago

But how can this be called? If I do example.match(regex) it breaks because example is empty.

anubhava Over a year ago

@mrfox This is built for allowing empty strings also. May I know what is the value of the your example string?

MrFox Over a year ago

@anubhava the value of my example is an input field from the user, if the field is left empty it will be null. But this has been solved: check for null beforehand and set example to "".

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