Testsuite: regression-test for bug. Bug 2449

[users/jgh/exim.git] / test / scripts / 0000-Basic / 0002

diff --git a/test/scripts/0000-Basic/0002 b/test/scripts/0000-Basic/0002
index cf8dc36e04a374ce0d58dde3422299238c923d44..2bf8f164e3f79ba5847527493fcb67e21403ce4f 100644 (file)
--- a/test/scripts/0000-Basic/0002
+++ b/test/scripts/0000-Basic/0002
@@ -45,6 +45,44 @@ x\
 +$11111111111111111111111111111111111
 +${11111111111111111111111111111111111}
 
 +$11111111111111111111111111111111111
 +${11111111111111111111111111111111111}
 

+eval:   ${eval:0}
+eval:   ${eval:1}
+eval:   ${eval:-1}
+eval:   ${eval:+1}
+eval:   ${eval:1+1}
+eval:   ${eval:1+2*3}
+eval:   ${eval:(1+2)*3}
+eval:   ${eval:3/2*4}
+eval:   ${eval:3*4/2}
+eval:   ${eval:42}
+eval:   ${eval:}
+eval:   ${eval:-2}
+eval:   ${eval:-2 - -3}
+eval:   ${eval:-2 - (-3)}
+eval:   ${eval:-2 - (-3}
+eval:   ${eval:-2 - -3)}
+eval:   ${eval:-2 --3}
+eval:   ${eval:-2 -+3}
+eval:   ${eval:-2 -+-3}
+eval:   ${eval:(2*(1+1))/2 + 40K}
+eval:   ${eval:077}
+eval:   ${eval:08}
+eval10: ${eval10:077}
+eval10: ${eval10:08}
+eval10: ${eval10:0x1234}
+eval:   ${eval:2+42%5}
+eval:   ${eval:0xc&5}
+eval:   ${eval:0xc & 5 }
+eval:   ${eval:0x0c|5}
+eval:   ${eval:0xc^5}
+eval:   ${eval:0xc>>1}
+eval:   ${eval:0xc >> 2}
+eval:   ${eval:0xc >> 4 }
+eval:   ${eval:0xc<<1}
+eval:   ${eval:~255&0x1234}
+eval:   ${eval:~ 255&0x1234}
+eval:   ${eval: -(~255&0x1234)}
+

 # List operations
 
 filter: "${filter{a:b:c}{eq{1}{1}}}"
 # List operations
 
 filter: "${filter{a:b:c}{eq{1}{1}}}"


@@ -123,8 +161,15 @@ acl: ${reduce {1:2:3:4} {} {$value ${acl {a_ret}{$item}}}}
 
 addrss: ${address:local-part@dom.ain}
 addrss: ${address:Exim Person <local-part@dom.ain> (that's me)}
 
 addrss: ${address:local-part@dom.ain}
 addrss: ${address:Exim Person <local-part@dom.ain> (that's me)}

+addrss: ${address:Exim Person <local-part(comment)@dom.ain> (that's me)}
+addrss: ${address:Exim Person <local-part@dom.ain(comment)> (that's me)}
+addrss: ${address:Exim Person <local-part(comment)@dom.ain(comment2)> (that's me)}
+addrss: ${address:Exim Person <local-part.(comment)dot-atom@dom.ain(comment2)> (that's me)}
+addrss: ${address:Exim Person <(comment)local-part@dom.ain(comment2)> (that's me)}

 domain: ${domain:local-part@dom.ain}
 domain: ${domain:Exim Person <local-part@dom.ain> (that's me)}
 domain: ${domain:local-part@dom.ain}
 domain: ${domain:Exim Person <local-part@dom.ain> (that's me)}

+domain: ${domain:Exim Person <local-part(foo)@(bar)dom.ain> (that's me)}
+domain: ${domain:a.b.c}

 
 addresses: ${addresses:>' 'abc@xyz, 'pqr@xyz}
 addresses: ${addresses:Exim Person <local-part@dom.ain> (that's me)}
 
 addresses: ${addresses:>' 'abc@xyz, 'pqr@xyz}
 addresses: ${addresses:Exim Person <local-part@dom.ain> (that's me)}


@@ -133,44 +178,11 @@ addresses: ${addresses:>+ Exim Person <local-part@dom.ain> (that's me),\
 addresses: ${addresses:Exim Person <local-part@dom.ain> (that's me), \
            xyz@abc, nullgroupname:;, group: p@q, r@s; }
 addresses: ${addresses:local-part@dom.ain <local-part@dom.ain>}
 addresses: ${addresses:Exim Person <local-part@dom.ain> (that's me), \
            xyz@abc, nullgroupname:;, group: p@q, r@s; }
 addresses: ${addresses:local-part@dom.ain <local-part@dom.ain>}

+addresses: ${addresses:>}

 
 escape:     ${escape:B7·F2ò}
 excape8bit: ${escape8bit:undisturbed text\ttab\nnewline\ttab\\backslash \176tilde\177DEL\200\x81.}
 
 
 escape:     ${escape:B7·F2ò}
 excape8bit: ${escape8bit:undisturbed text\ttab\nnewline\ttab\\backslash \176tilde\177DEL\200\x81.}
 

-eval:   ${eval:1+1}
-eval:   ${eval:1+2*3}
-eval:   ${eval:(1+2)*3}
-eval:   ${eval:3/2*4}
-eval:   ${eval:3*4/2}
-eval:   ${eval:42}
-eval:   ${eval:}
-eval:   ${eval:-2}
-eval:   ${eval:-2 - -3}
-eval:   ${eval:-2 - (-3)}
-eval:   ${eval:-2 - (-3}
-eval:   ${eval:-2 - -3)}
-eval:   ${eval:-2 --3}
-eval:   ${eval:-2 -+3}
-eval:   ${eval:-2 -+-3}
-eval:   ${eval:(2*(1+1))/2 + 40K}
-eval:   ${eval:077}
-eval:   ${eval:08}
-eval10: ${eval10:077}
-eval10: ${eval10:08}
-eval10: ${eval10:0x1234}
-eval:   ${eval:2+42%5}
-eval:   ${eval:0xc&5}
-eval:   ${eval:0xc & 5 }
-eval:   ${eval:0x0c|5}
-eval:   ${eval:0xc^5}
-eval:   ${eval:0xc>>1}
-eval:   ${eval:0xc >> 2}
-eval:   ${eval:0xc >> 4 }
-eval:   ${eval:0xc<<1}
-eval:   ${eval:~255&0x1234}
-eval:   ${eval:~ 255&0x1234}
-eval:   ${eval: -(~255&0x1234)}
-

 expand: \$primary_hostname ${expand:\$primary_hostname}
 hash:   ${hash_3:monty} ${hash_5:monty} ${hash_4_62:monty python}
 hash:   ${hash_3:abc}X ${hash_3:ab}X ${hash_3:a}X ${hash_3:}X
 expand: \$primary_hostname ${expand:\$primary_hostname}
 hash:   ${hash_3:monty} ${hash_5:monty} ${hash_4_62:monty python}
 hash:   ${hash_3:abc}X ${hash_3:ab}X ${hash_3:a}X ${hash_3:}X


@@ -197,7 +209,7 @@ base32d: 32 ${base32d:${base32:32}}
 base32d: 42 ${base32d:${base32:42}}
 base32d error: ABC ${base32d:ABC}
 
 base32d: 42 ${base32d:${base32:42}}
 base32d error: ABC ${base32d:ABC}
 

-The base62 operator is actually a base36 operator in the Darwin and Cygwin
+the base62 operator is actually a base36 operator in the Darwin and Cygwin

 environments. Write cunning tests that produce the same output in both cases,
 while doing a reasonable check.
 
 environments. Write cunning tests that produce the same output in both cases,
 while doing a reasonable check.
 


@@ -243,6 +255,8 @@ lc/uc:  ${lc:The Quick} ${uc: Brown Fox}
 length: ${length_10:The quick brown fox} ${l_10:abc}
 lclpt:  ${local_part:local-part@dom.ain}
 lclpt:  ${local_part:Exim Person <local-part@dom.ain> (that's me)}
 length: ${length_10:The quick brown fox} ${l_10:abc}
 lclpt:  ${local_part:local-part@dom.ain}
 lclpt:  ${local_part:Exim Person <local-part@dom.ain> (that's me)}

+lclpt:  ${local_part:Exim Person <local(comment).part@dom.(comment2)ain> (that's me)}
+lclpt:  ${local_part:a.b.c}

 quote:  ${quote:aZ09_.-Q} ${quote:ab*cd} ${quote:ab\cd"ef}
 quote:  ${quote:nl(\n)}
 quote:  ${quote:cr(\r)}
 quote:  ${quote:aZ09_.-Q} ${quote:ab*cd} ${quote:ab\cd"ef}
 quote:  ${quote:nl(\n)}
 quote:  ${quote:cr(\r)}


@@ -417,6 +431,8 @@ gei:    ${if gei{ABC}{abc}{y}{n}}
 isip:   ${if isip {1.2.3.4}{y}{n}}  1.2.3.4
 isip4:  ${if isip4{1.2.3.4}{y}{n}}  1.2.3.4
 isip6:  ${if isip6{1.2.3.4}{y}{n}}  1.2.3.4
 isip:   ${if isip {1.2.3.4}{y}{n}}  1.2.3.4
 isip4:  ${if isip4{1.2.3.4}{y}{n}}  1.2.3.4
 isip6:  ${if isip6{1.2.3.4}{y}{n}}  1.2.3.4

+isip:   ${if isip {::1.2.3.256}{y}{n}}  ::1.2.3.256
+isip4:  ${if isip4{1.2.3.256}{y}{n}}  1.2.3.256

 isip:   ${if isip {1:2:3:4}{y}{n}}  1:2:3:4
 isip4:  ${if isip4{1:2:3:4}{y}{n}}  1:2:3:4
 isip6:  ${if isip6{1:2:3:4}{y}{n}}  1:2:3:4
 isip:   ${if isip {1:2:3:4}{y}{n}}  1:2:3:4
 isip4:  ${if isip4{1:2:3:4}{y}{n}}  1:2:3:4
 isip6:  ${if isip6{1:2:3:4}{y}{n}}  1:2:3:4


@@ -426,6 +442,7 @@ isip6:  ${if isip6{::1}{y}{n}}      ::1
 isip:   ${if isip {fe80::a00:20ff:fe86:a061}{y}{n}}  fe80::a00:20ff:fe86:a061
 isip4:  ${if isip4{fe80::a00:20ff:fe86:a061}{y}{n}}  fe80::a00:20ff:fe86:a061
 isip6:  ${if isip6{fe80::a00:20ff:fe86:a061}{y}{n}}  fe80::a00:20ff:fe86:a061
 isip:   ${if isip {fe80::a00:20ff:fe86:a061}{y}{n}}  fe80::a00:20ff:fe86:a061
 isip4:  ${if isip4{fe80::a00:20ff:fe86:a061}{y}{n}}  fe80::a00:20ff:fe86:a061
 isip6:  ${if isip6{fe80::a00:20ff:fe86:a061}{y}{n}}  fe80::a00:20ff:fe86:a061

+isip:   ${if isip {fe80::1.2.3.4}{y}{n}}  fe80::1.2.3.4

 isip:   ${if isip {rhubarb}{y}{n}}  rhubarb
 isip4:  ${if isip4{rhubarb}{y}{n}}  rhubarb
 isip6:  ${if isip6{rhubarb}{y}{n}}  rhubarb
 isip:   ${if isip {rhubarb}{y}{n}}  rhubarb
 isip4:  ${if isip4{rhubarb}{y}{n}}  rhubarb
 isip6:  ${if isip6{rhubarb}{y}{n}}  rhubarb


@@ -527,8 +544,8 @@ abc:   ${lookup{abc}wildlsearch{DIR/aux-var/0002.wild}}
 a.b.c: ${lookup{a.b.c}wildlsearch{DIR/aux-var/0002.wild}}
 ab.c:  ${lookup{ab.c}wildlsearch{DIR/aux-var/0002.wild}}
 xyz:   ${lookup{xyz}wildlsearch{DIR/aux-var/0002.wild}}
 a.b.c: ${lookup{a.b.c}wildlsearch{DIR/aux-var/0002.wild}}
 ab.c:  ${lookup{ab.c}wildlsearch{DIR/aux-var/0002.wild}}
 xyz:   ${lookup{xyz}wildlsearch{DIR/aux-var/0002.wild}}

-Xyz:   ${lookup{Xyz}wildlsearch{DIR/aux-var/0002.wild}}
-Zyz:   ${lookup{Zyz}wildlsearch{DIR/aux-var/0002.wild}}
+.Xyz:   ${lookup{Xyz}wildlsearch{DIR/aux-var/0002.wild}}
+.Zyz:   ${lookup{Zyz}wildlsearch{DIR/aux-var/0002.wild}}

 a b:   ${lookup{a b}wildlsearch{DIR/aux-var/0002.wild}}
 a  b:  ${lookup{a  b}wildlsearch{DIR/aux-var/0002.wild}}
 a:b:   ${lookup{a:b}wildlsearch{DIR/aux-var/0002.wild}}
 a b:   ${lookup{a b}wildlsearch{DIR/aux-var/0002.wild}}
 a  b:  ${lookup{a  b}wildlsearch{DIR/aux-var/0002.wild}}
 a:b:   ${lookup{a:b}wildlsearch{DIR/aux-var/0002.wild}}


@@ -543,8 +560,8 @@ abc:   ${lookup{abc}nwildlsearch{DIR/aux-var/0002.wild}}
 a.b.c: ${lookup{a.b.c}nwildlsearch{DIR/aux-var/0002.wild}}
 ab.c:  ${lookup{ab.c}nwildlsearch{DIR/aux-var/0002.wild}}
 xyz:   ${lookup{xyz}nwildlsearch{DIR/aux-var/0002.wild}}
 a.b.c: ${lookup{a.b.c}nwildlsearch{DIR/aux-var/0002.wild}}
 ab.c:  ${lookup{ab.c}nwildlsearch{DIR/aux-var/0002.wild}}
 xyz:   ${lookup{xyz}nwildlsearch{DIR/aux-var/0002.wild}}

-Xyz:   ${lookup{Xyz}nwildlsearch{DIR/aux-var/0002.wild}}
-Zyz:   ${lookup{Zyz}nwildlsearch{DIR/aux-var/0002.wild}}
+.Xyz:   ${lookup{Xyz}nwildlsearch{DIR/aux-var/0002.wild}}
+.Zyz:   ${lookup{Zyz}nwildlsearch{DIR/aux-var/0002.wild}}

 a b:   ${lookup{a b}nwildlsearch{DIR/aux-var/0002.wild}}
 a  b:  ${lookup{a  b}nwildlsearch{DIR/aux-var/0002.wild}}
 a:b:   ${lookup{a:b}nwildlsearch{DIR/aux-var/0002.wild}}
 a b:   ${lookup{a b}nwildlsearch{DIR/aux-var/0002.wild}}
 a  b:  ${lookup{a  b}nwildlsearch{DIR/aux-var/0002.wild}}
 a:b:   ${lookup{a:b}nwildlsearch{DIR/aux-var/0002.wild}}


@@ -563,10 +580,10 @@ a\\:Xb: ${lookup{a\\:Xb}nwildlsearch{DIR/aux-var/0002.wild}}
 
 # Some tests of case-(in)dependence
 
 
 # Some tests of case-(in)dependence
 

-MiXeD-CD:  ${lookup{MiXeD-CD}nwildlsearch{DIR/aux-var/0002.wild}{$value}{NOT FOUND}}
-MixeD-CD:  ${lookup{MixeD-CD}nwildlsearch{DIR/aux-var/0002.wild}{$value}{NOT FOUND}}
-MiXeD-Ncd: ${lookup{MiXeD-Ncd}nwildlsearch{DIR/aux-var/0002.wild}{$value}{NOT FOUND}}
-MixeD-Ncd: ${lookup{MixeD-Ncd}nwildlsearch{DIR/aux-var/0002.wild}{$value}{NOT FOUND}}
+.MiXeD-CD:  ${lookup{MiXeD-CD}nwildlsearch{DIR/aux-var/0002.wild}{$value}{NOT FOUND}}
+.MixeD-CD:  ${lookup{MixeD-CD}nwildlsearch{DIR/aux-var/0002.wild}{$value}{NOT FOUND}}
+.MiXeD-Ncd: ${lookup{MiXeD-Ncd}nwildlsearch{DIR/aux-var/0002.wild}{$value}{NOT FOUND}}
+.MixeD-Ncd: ${lookup{MixeD-Ncd}nwildlsearch{DIR/aux-var/0002.wild}{$value}{NOT FOUND}}

 
 # IP address (CIDR) lookups
 
 
 # IP address (CIDR) lookups
 


@@ -610,12 +627,12 @@ ${extract{B}{A=1 B=2 C=3}}
 ${extract{ B }{A=1 B=2 C=3}{$value}{NOT FOUND}}
 ${extract{2}{:}{1:2:3}}
 ${extract{ 2 }{:}{1:2:3}{$value}{NOT FOUND}}
 ${extract{ B }{A=1 B=2 C=3}{$value}{NOT FOUND}}
 ${extract{2}{:}{1:2:3}}
 ${extract{ 2 }{:}{1:2:3}{$value}{NOT FOUND}}

-Empty:<${extract{D}{A=1 B=2 C=3}}>
-Empty:<${extract{4}{:}{1:2:3}}>
+empty:<${extract{D}{A=1 B=2 C=3}}>
+empty:<${extract{4}{:}{1:2:3}}>

 ${extract{C}{A=1 B=2 C=3}{<$value>}}
 ${extract{3}{:}{1:2:3}{<$value>}}
 ${extract{C}{A=1 B=2 C=3}{<$value>}}
 ${extract{3}{:}{1:2:3}{<$value>}}

-Empty:<${extract{Z}{A=1 B=2 C=3}{<$value>}}>
-Empty:<${extract{4}{:}{1:2:3}{<$value>}}>
+empty:<${extract{Z}{A=1 B=2 C=3}{<$value>}}>
+empty:<${extract{4}{:}{1:2:3}{<$value>}}>

 ${extract{Z}{A=1 B=2 C=3}{<$value>}{no Z}}
 ${extract{4}{:}{1:2:3}{<$value>}{no 4}}
 ${extract{Z}{A=1 B=2 C=3}{<$value>}fail}
 ${extract{Z}{A=1 B=2 C=3}{<$value>}{no Z}}
 ${extract{4}{:}{1:2:3}{<$value>}{no 4}}
 ${extract{Z}{A=1 B=2 C=3}{<$value>}fail}


@@ -694,8 +711,8 @@ abcdea abc z   ${tr{abcdea}{abc}{z}}
 abcd      ${rfc2047:abcd}
 <:abcd:>  ${rfc2047:<:abcd:>}
 <:ab cd:> ${rfc2047:<:ab cd:>}
 abcd      ${rfc2047:abcd}
 <:abcd:>  ${rfc2047:<:abcd:>}
 <:ab cd:> ${rfc2047:<:ab cd:>}

-Long:     ${rfc2047: here we go: a string that is going to be encoded: it will go over the 75-char limit}
-Long:     ${rfc2047: here we go: a string that is going to be encoded: it will go over the 75-char limit by a long way; in fact this one will go over the 150 character limit}
+long:     ${rfc2047: here we go: a string that is going to be encoded: it will go over the 75-char limit}
+long:     ${rfc2047: here we go: a string that is going to be encoded: it will go over the 75-char limit by a long way; in fact this one will go over the 150 character limit}

 
 # RFC 2047 decode
 
 
 # RFC 2047 decode
 


@@ -735,21 +752,21 @@ ${if exists{/non/exist/file}{${readfile{/non/exist/file}}}{non-exist}}
 # Calling a command
 
 ${run{DIR/aux-fixed/0002.runfile 0}}
 # Calling a command
 
 ${run{DIR/aux-fixed/0002.runfile 0}}

-RC=$runrc
+rc=$runrc

 ${run{DIR/aux-fixed/0002.runfile 0}{1}{2}}
 ${run{DIR/aux-fixed/0002.runfile 0}{1}{2}}

-RC=$runrc
+rc=$runrc

 ${run{DIR/aux-fixed/0002.runfile 0}{$value}{2}}
 ${run{DIR/aux-fixed/0002.runfile 0}{$value}{2}}

-RC=$runrc
+rc=$runrc

 ${run{DIR/aux-fixed/0002.runfile 1}{$value}{2}}
 ${run{DIR/aux-fixed/0002.runfile 1}{$value}{2}}

-RC=$runrc
+rc=$runrc

 ${run{DIR/aux-fixed/0002.runfile 1}{$value}{$value}}
 ${run{DIR/aux-fixed/0002.runfile 1}{$value}{$value}}

-RC=$runrc
+rc=$runrc

 ${run{DIR/test-nonexist}{Y}{N}}
 ${run{DIR/test-nonexist}{Y}{N}}

-RC=$runrc
+rc=$runrc

 >>${run{DIR/bin/iefbr14}}<<
 >>${run{DIR/bin/iefbr14}}<<

-RC=$runrc
+rc=$runrc

 ${if eq{1}{2}{${run{/non/exist}}}{1!=2}}
 ${if eq{1}{2}{${run{/non/exist}}}{1!=2}}

-RC=$runrc
+rc=$runrc

 
 # PRVS
 
 
 # PRVS
 


@@ -870,13 +887,62 @@ ${if ={1}{1} {true}{${if ={1}{1} {true}{${if ={1}{1}{true}fail}}}}}
 ${env {USER}}
 ${env {NO_SUCH_VARIABLE} {oops, success} {correct}}
 
 ${env {USER}}
 ${env {NO_SUCH_VARIABLE} {oops, success} {correct}}
 

+# JSON
+
+${extract json {Url} \
+  {   \{ \"Url\":    \"http://www.example.com/image/481989943\",\
+        \"Height\": 125,\
+        \"Width\":  100\
+      \} \
+  } \
+ }
+${extract json {Width} \
+  {   \{ \"Url\":    \"http://www.example.com/image/481989943\",\
+        \"Height\": 125,\
+        \"Width\":  100\
+      \} \
+  } \
+ }
+${extract json {2} {[116, 943, 234, 38793]} }
+${extract json {2} {${extract json{IDs} {\{"other":"foo", "IDs": [116, 943, 234]\} }}} }
+
+${extract json {2} {["red", "green", "blue", "black"]} }
+${extract jsons{2} {["red", "green", "blue", "black"]} }
+<${extract jsons{5} {["red", "green", "blue", "black"]} }>
+expect: <>
+
+${extract json {seconds} { \{"hours":0, "mins":0, "seconds":59\} }}
+${extract json {seconds} {${extract json {2} { ["irrelevant", \{"hours":0, "mins":0, "seconds":59\}] }}}}
+
+${extract json{IDs}{ \{"IDs": \{"1":116, "2":943, "3":234\}\} }}
+expect: {"1":116, "2":943, "3":234}
+
+${extract json{IDs}{ \{"id": \{"a":101, "b":102\}, "IDs": \{"1":116, "2":943, "3":234\}\} }}
+expect: {"1":116, "2":943, "3":234}
+
+<${extract json{nonexistent}{ \{"id": \{"a":101, "b":102\}, "IDs": \{"1":116, "2":943, "3":234\}\} }}>
+expect: <>
+<${extract jsons{nonexistent}{ \{"id": \{"a":101, "b":102\}, "IDs": \{"1":116, "2":943, "3":234\}\} }}>
+expect: <>
+
+${if forany_json {[1, 2, 3]}{={$item}{1}}{yes}{no}}
+${if forany_jsons{["A", "B", "C"]}{eq{$item}{B}}{yes}{no}}
+

 ****
 # Test "escape" with print_topbitchars
 exim -be -DPTBC=print_topbitchars
 escape: ${escape:B7·F2ò}
 ****
 # Checkout expansion debugging
 ****
 # Test "escape" with print_topbitchars
 exim -be -DPTBC=print_topbitchars
 escape: ${escape:B7·F2ò}
 ****
 # Checkout expansion debugging

-exim -d-all+expand -be
+exim -d-all+expand -f sndr@dom -be
+primary_hostname: $primary_hostname
+sender_address: $sender_address
+match:  ${if match{abcd}{\N^([ab]+)(\w+)$\N}{$2$1}fail}
+match:  ${if match{wxyz}{\N^([ab]+)(\w+)$\N}{$2$1}fail}
+${if eq {1}{1}{yes}{${lookup{xx}lsearch{/non/exist}}}}
+match_address:   ${if match_address{a.b.c}{a.b.c}{yes}{no}}
+****
+exim -d-all+expand+noutf8 -be

 primary_hostname: $primary_hostname
 match:  ${if match{abcd}{\N^([ab]+)(\w+)$\N}{$2$1}fail}
 match:  ${if match{wxyz}{\N^([ab]+)(\w+)$\N}{$2$1}fail}
 primary_hostname: $primary_hostname
 match:  ${if match{abcd}{\N^([ab]+)(\w+)$\N}{$2$1}fail}
 match:  ${if match{wxyz}{\N^([ab]+)(\w+)$\N}{$2$1}fail}