Regex optional substring in the pattern

Question

I have a string as Failed to acquire capacity on the hall And sometimes I might also get Failed to acquire new capacity on the hall. So to cover both the cases I want to make new as optional.

So I grouped new with ? as (new)? in the pattern as below

pattern : failed to acquire (new)? capacity.

But its not working as expected, i.e matching Failed to acquire capacity on the hall even though new is there or not. Ref: https://regex101.com/r/2YhjKc/1

What is the mistake I am doing here ?

Thank you.

you have an extra space after new. Include the space or remove it: failed to acquire (new )? capacity — R. Schifini
– R. Schifini, Commented Jan 30, 2020 at 3:30

Tim Biegeleisen · Accepted Answer · 2020-01-30 03:30:43Z

4

The word new is also surrounded with whitespace, which you should also take into account, e.g.

failed to acquire\s+(new\s+)?capacity

Demo

answered Jan 30, 2020 at 3:30

Tim Biegeleisen

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