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Postings from September 2011
On Wed Jun 15 11:26:50 2011, ph10@hermes.cam.ac.uk wrote: > It seems to me that, if what precedes (*THEN) in a branch matches > only a fixed string (no backtracking points), then the behaviour > should be exactly the same as if (*THEN) is not present. Here is > an example where that is not so: > > Pattern: /^.*?(?(?=a)a|b(*THEN)c)/ > Subject: ba > Result: no match > > Pattern: /^.*?(?(?=a)a|bc)/ > Subject: ba > Result: matches "ba" > > I noticed this because I have just fixed the same bug in PCRE. Do the pipes in the (?(...)...) condition expression count as regular alternations? It seems they don’t. Should they?Thread Previous