Regex in Tags

[AlexSN]

Hi!

Anybody knows why this regex: {ITEM.VALUE}.regsub((?<=[\s\S]{250})([\s\S]{0,250})),\1)}

does always get the beginning of the string (from char 0, 250 chars=, instead of the 250 chars after the first 250 chars (from char 250, 250chars)?
Does anybody know if this expression is OK in a Zabbix Tag?

Thanks in advance,
Alex

[AlexSN]

Still no luck... the regex works in regex101 and other online regex test pages, but not in zabbix