diff --git a/testdata/testinput1 b/testdata/testinput1
index b449969..1f32d95 100644
--- a/testdata/testinput1
+++ b/testdata/testinput1
@@ -5920,4 +5920,65 @@ ef) x/x,mark
 /^(?1)\d{3}(a)/
     a123a
 
+# This pattern uses a lot of named subpatterns in order to match email
+# addresses in various formats. It's a heavy test for named subpatterns. In the
+# <atext> group, slash is coded as \x{2f} so that this pattern can also be
+# processed by perltest.sh, which does not cater for an escaped delimiter
+# within the pattern. All $ and @ characters in subject strings are escaped so
+# that Perl doesn't interpret them as variable insertions and " characters must
+# also be escaped for Perl.
+
+# This set of subpatterns is more or less a direct transliteration of the BNF
+# definitions in RFC2822, without any of the obsolete features. The addition of
+# a possessive + to the definition of <phrase> reduced the match limit in PCRE2
+# from over 5 million to just under 400, and eliminated a very noticeable delay
+# when this file was passed to perltest.sh.
+
+/(?ix)(?(DEFINE)
+(?<addr_spec>       (?&local_part) \@ (?&domain) )
+(?<angle_addr>      (?&CFWS)?+ < (?&addr_spec) > (?&CFWS)?+ )
+(?<atext>           [a-z\d!#$%&'*+-\x{2f}=?^_`{|}~] )
+(?<atom>            (?&CFWS)?+ (?&atext)+ (?&CFWS)?+ )
+(?<ccontent>        (?&ctext) | (?&quoted_pair) | (?&comment) )
+(?<ctext>           [^\x{9}\x{10}\x{13}\x{7f}-\x{ff}\ ()\\] )
+(?<comment>         \( (?: (?&FWS)?+ (?&ccontent) )*+ (?&FWS)?+ \) )
+(?<CFWS>            (?: (?&FWS)?+ (?&comment) )* (?# NOT possessive)
+                    (?: (?&FWS)?+ (?&comment) | (?&FWS) ) )
+(?<dcontent>        (?&dtext) | (?&quoted_pair) )
+(?<display_name>    (?&phrase) )
+(?<domain>          (?&dot_atom) | (?&domain_literal) )
+(?<domain_literal>  (?&CFWS)?+ \[ (?: (?&FWS)?+ (?&dcontent) )* (?&FWS)?+ \]
+                    (?&CFWS)?+ )
+(?<dot_atom>        (?&CFWS)?+ (?&dot_atom_text) (?&CFWS)?+ )
+(?<dot_atom_text>   (?&atext)++ (?: \. (?&atext)++)*+ )
+(?<dtext>           [^\x{9}\x{10}\x{13}\x{7f}-\x{ff}\ \[\]\\] )
+(?<FWS>             (?: [\t\ ]*+ \n)?+ [\t\ ]++ )
+(?<local_part>      (?&dot_atom) | (?&quoted_string)  )
+(?<mailbox>         (?&name_addr) | (?&addr_spec) )
+(?<name_addr>       (?&display_name)? (?&angle_addr) )
+(?<phrase>          (?&word)++ )
+(?<qcontent>        (?&qtext) | (?&quoted_pair) )
+(?<quoted_pair>     " (?&text) )
+(?<quoted_string>   (?&CFWS)?+ " (?: (?&FWS)?+ (?&qcontent))* (?&FWS)?+ "
+                    (?&CFWS)?+ )
+(?<qtext>           [^\x{9}\x{10}\x{13}\x{7f}-\x{ff}\ "\\] )
+(?<text>            [^\r\n] )
+(?<word>            (?&atom) | (?&quoted_string) )
+) # End DEFINE
+^(?&mailbox)$/
+    Alan Other <user\@dom.ain>
+    <user\@dom.ain>
+    user\@dom.ain
+    user\@[] 
+    user\@[domain literal] 
+    user\@[domain literal with \"[square brackets\"] inside] 
+    \"A. Other\" <user.1234\@dom.ain> (a comment)
+    A. Other <user.1234\@dom.ain> (a comment)
+    \"/s=user/ou=host/o=place/prmd=uu.yy/admd= /c=gb/\"\@x400-re.lay
+\= Expect no match
+    A missing angle <user\@some.where
+    The quick brown fox
+    
+# -------------------------------------------------------------------------- 
+
 # End of testinput1 
diff --git a/testdata/testoutput1 b/testdata/testoutput1
index 43ed7fa..27c7345 100644
--- a/testdata/testoutput1
+++ b/testdata/testoutput1
@@ -9492,4 +9492,76 @@ No match
  0: a123a
  1: a
 
+# This pattern uses a lot of named subpatterns in order to match email
+# addresses in various formats. It's a heavy test for named subpatterns. In the
+# <atext> group, slash is coded as \x{2f} so that this pattern can also be
+# processed by perltest.sh, which does not cater for an escaped delimiter
+# within the pattern. All $ and @ characters in subject strings are escaped so
+# that Perl doesn't interpret them as variable insertions and " characters must
+# also be escaped for Perl.
+
+# This set of subpatterns is more or less a direct transliteration of the BNF
+# definitions in RFC2822, without any of the obsolete features. The addition of
+# a possessive + to the definition of <phrase> reduced the match limit in PCRE2
+# from over 5 million to just under 400, and eliminated a very noticeable delay
+# when this file was passed to perltest.sh.
+
+/(?ix)(?(DEFINE)
+(?<addr_spec>       (?&local_part) \@ (?&domain) )
+(?<angle_addr>      (?&CFWS)?+ < (?&addr_spec) > (?&CFWS)?+ )
+(?<atext>           [a-z\d!#$%&'*+-\x{2f}=?^_`{|}~] )
+(?<atom>            (?&CFWS)?+ (?&atext)+ (?&CFWS)?+ )
+(?<ccontent>        (?&ctext) | (?&quoted_pair) | (?&comment) )
+(?<ctext>           [^\x{9}\x{10}\x{13}\x{7f}-\x{ff}\ ()\\] )
+(?<comment>         \( (?: (?&FWS)?+ (?&ccontent) )*+ (?&FWS)?+ \) )
+(?<CFWS>            (?: (?&FWS)?+ (?&comment) )* (?# NOT possessive)
+                    (?: (?&FWS)?+ (?&comment) | (?&FWS) ) )
+(?<dcontent>        (?&dtext) | (?&quoted_pair) )
+(?<display_name>    (?&phrase) )
+(?<domain>          (?&dot_atom) | (?&domain_literal) )
+(?<domain_literal>  (?&CFWS)?+ \[ (?: (?&FWS)?+ (?&dcontent) )* (?&FWS)?+ \]
+                    (?&CFWS)?+ )
+(?<dot_atom>        (?&CFWS)?+ (?&dot_atom_text) (?&CFWS)?+ )
+(?<dot_atom_text>   (?&atext)++ (?: \. (?&atext)++)*+ )
+(?<dtext>           [^\x{9}\x{10}\x{13}\x{7f}-\x{ff}\ \[\]\\] )
+(?<FWS>             (?: [\t\ ]*+ \n)?+ [\t\ ]++ )
+(?<local_part>      (?&dot_atom) | (?&quoted_string)  )
+(?<mailbox>         (?&name_addr) | (?&addr_spec) )
+(?<name_addr>       (?&display_name)? (?&angle_addr) )
+(?<phrase>          (?&word)++ )
+(?<qcontent>        (?&qtext) | (?&quoted_pair) )
+(?<quoted_pair>     " (?&text) )
+(?<quoted_string>   (?&CFWS)?+ " (?: (?&FWS)?+ (?&qcontent))* (?&FWS)?+ "
+                    (?&CFWS)?+ )
+(?<qtext>           [^\x{9}\x{10}\x{13}\x{7f}-\x{ff}\ "\\] )
+(?<text>            [^\r\n] )
+(?<word>            (?&atom) | (?&quoted_string) )
+) # End DEFINE
+^(?&mailbox)$/
+    Alan Other <user\@dom.ain>
+ 0: Alan Other <user@dom.ain>
+    <user\@dom.ain>
+ 0: <user@dom.ain>
+    user\@dom.ain
+ 0: user@dom.ain
+    user\@[] 
+ 0: user@[]
+    user\@[domain literal] 
+ 0: user@[domain literal]
+    user\@[domain literal with \"[square brackets\"] inside] 
+ 0: user@[domain literal with "[square brackets"] inside]
+    \"A. Other\" <user.1234\@dom.ain> (a comment)
+ 0: "A. Other" <user.1234@dom.ain> (a comment)
+    A. Other <user.1234\@dom.ain> (a comment)
+ 0: A. Other <user.1234@dom.ain> (a comment)
+    \"/s=user/ou=host/o=place/prmd=uu.yy/admd= /c=gb/\"\@x400-re.lay
+ 0: "/s=user/ou=host/o=place/prmd=uu.yy/admd= /c=gb/"@x400-re.lay
+\= Expect no match
+    A missing angle <user\@some.where
+No match
+    The quick brown fox
+No match
+    
+# -------------------------------------------------------------------------- 
+
 # End of testinput1