Regex not working with regexp_count

Hi,

I have a simple regex I want to use to validate mobile phone numbers:
‘^\+?\d+$' – this checks for 0 or 1 ‘+’ followed by any amount of digits

When I test this on various regex websites (regextester.com for example) it seems to do the job perfectly.

But when I plug this into my interactive SQL session like so:
select regexp_count('07777','^\+?\d+$') from SYSIBM/SYSDUMMY1

I get the following error:
1 -- The external program or service program returned SQLSTATE 2201S. The
text message returned from the program is: ????REGEXP_COUNT????^\+?\d+$ .

This SQLSTATE is “Invalid regular expression pattern.”

I’m sure I’m doing something wrong but unsure what. I have read the IBM documentation and my syntax seems to be valid (?)

Cheers

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