https://bugs.documentfoundation.org/show_bug.cgi?id=118505
--- Comment #5 from Eike Rathke <[email protected]> ---
Testing expressions in an online tester (for example https://regex101.com/) may
help, it even gives some explanation about the expression entered and if
quantifiers are greedy/docile/lazy/possessive. The default PCRE dialect is fine
and quite close to the Java inspired regex of ICU, though there are subtle
differences. Note that the match offsets in that tester (and others) are
0-based while in Calc they are 1-based. For the quantifiers subtleties see
https://www.rexegg.com/regex-quantifiers.html
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