Suggested Solution:

Improve the supported REGEX within the match() function to include negative lookahead REGEX

To replicate:

Create a match function utilizing negative lookahead REGEX e.g:

.match("[\s\S]?(?=TestString)" 

this will fail however this is valid REGEX when testing within REGEX testing tools/playground.

Why is this important:

Provide increased functionality for REGEX within automation for JIRA.

Workaround:

Utilize any of the following automation functions:

remove(String remove)

Removes characters from text.

{{issue.summary.remove("l")}} -> Heo Word!

For more information, see: StringUtils.remove(String).

substringBefore(String separator)

Returns the text before the first occurrence of the given separator.

{{issue.summary.substringBefore("W")}} -> Hello

More info on StringUtils. substringBefore(String)

substringBeforeLast(String separator)

Returns the text before the last occurrence of the given separator.

{{issue.summary.substringBeforeLast("o")}} -> Hello W

More info on StringUtils. substringBeforeLast(String)