Annex: Validation regex patterns and examples
String validation regex pattern (e.g., for header fields)
Value matching for strings (e.g. header field keys and values) is case-sensitive.
Example
For header field values, only the exact spelling matches: “URGENT MAIL” in the subject does
not match a condition referring to the value “urgent mail”.
Wildcards
For every condition, max. one asterisk (*) and max. eight question marks (?) may be
included. An asterisk replaces zero or any one or more characters, a question mark replaces zero or
exactly one character.
Regex patterns
String:
type: string
minLength: 1
maxLength: 256
pattern: ^[\x0A -~]+$
String with wildcards:
type: string
minLength: 1
maxLength: 256
allOf:
- pattern: ^[\x0A -~]+$
- pattern: ^[^\][\]?[^\]*$
- pattern: ^([^?][?]){0,8}[^?]$Email address and domain validation regex patterns
Value matching for email addresses and domains is NOT case-sensitive, so it doesn’t matter if you are using capital or small letters.
Example
A condition including “Foo@BAR.com” matches the value “foo@bar.com”.
Wildcards
For every condition, max. one asterisk (*) and max. eight question marks (?) may be included. An asterisk replaces zero or any one or more characters, a question mark replaces zero or exactly one character.
Regex patterns
Email address:
type: string
minLength: 5
maxLength: 256
pattern:
([!#$%&'+/=?^{|}~a-zA-Z0-9_-]+\\.)*[!#$%&'*+/=?^_{|}~a-zA-Z0-9-]+@([a-zA-
Z0-9]+[-]+)[a-zA-Z0-9]+\.(([a-zA-Z0-9]+[-]+)[a-zA-Z0-9]+\.)[a-zA-Z0-9]+
Email address with wildcards:
type: string
minLength: 5
maxLength: 256
allOf:
- pattern:
([!#$%&'*+/=?^{|}~a-zA-Z0-9_-]+\\.)*[!#$%&'*+/=?^_{|}~a-zA-Z0-9-
]+@(([?\a-zA-Z0-9]+[-]+)[?\*a-zA-Z0-9]+\.(([?\a-zA-Z0-9]+[-]+)[?\a-zA-
Z0-9]+\.)[?\a-zA-Z0-9]+|\)
- pattern: ^[^\][\]?[^\]*$
- pattern: ^([^?][?]){0,8}[^?]$
Domain:
type: string
minLength: 3
maxLength: 253
pattern: ^(([a-zA-Z0-9]+[-]+)[a-zA-Z0-9]+\.)+([a-zA-Z0-9]+[-]+)[a-zA-Z0-9]+$
Domain with wildcards:
type: string
minLength: 3
maxLength: 253
allOf:
- pattern:
^(([?\a-zA-Z0-9]+[-]+)[?\*a-zA-Z0-9]+\.)+([?\a-zA-Z0-9]+[-]+)[?\*a-zA-Z0-9]+$
- pattern: ^[^\][\]?[^\]*$
- pattern: ^([^?][?]){0,8}[^?]$Email address validation – examples
Valid email address values (wildcards only working with operator Matches/MatchesNot):
sender??@example.com
sender??@.example.com
sender??@example.
sender@example.com
sender??@exhttp://le.com
!#$%&'*+-/=?^_`{|}~.test@rrr123.de
t-es-t@r-r-r-1-2-3.de
test1234.567890@rrr123.de
test@rrr-123.com-de
@rrr.de
test@.de.com
test@rrr.*
test@.de
??st@.co.??
Invalid email address values:
..@rrr123.de
test.@rrr123.de
.test@rrr123.de
test..test@rrr123.de
test@rrr123..de
test@rrr.de.
@.de
?@.rrr.de
test?????????@rrr.de
Domain validation – examples
Valid domain values (wildcards only working with operator Matches/MatchesNot):
rrr123.de
r-r-r-1-2-3.de
rrr----123.de
.de.us
rrr.
rrr..de
*.de
*.sad-eu.com
Invalid domain values:
rrr123..de
http://rrr.de
.rrr123.de
-rrr.de
rrr.de-
rrr.uk.
r_rr123.de
-retarus..com
test..
te**.de
-.com
IP address validation regex pattern
Wildcards: For every condition, max. one asterisk (*) and max. eight question marks (?) may be included. An asterisk replaces zero or any one or more characters, a question mark replaces zero or exactly one character.
Regex patterns
Source IP:
type: string
minLength: 7
maxLength: 15
pattern:
^((25[0-5]|2[0-4][0-9]|1?[1-9]?[0-9]|10[0-9])\.){3}(25[0-5]|2[0-4][0-9]|1?[1-9]?
[0-9]|10[0-9])$
Source IP with wildcards:
type: string
minLength: 7
maxLength: 15
allOf:
- pattern:
^(((\*|[1-9?][0-9?]{0,2}|0)\.){3}(\*|[1-9?][0-9?]{0,2}|0)|\*\.(([1-9?]
[0-9?]{0,2}|0)\.)?([1-9?][0-9?]{0,2}|0)|([1-9?][0-9?]{0,2}|0)\.\*\.([1-9?][0-9?]{0,2}|0)|(([1-9?][0-9?]{0,2}|0)\.){1,2}\*)$
- pattern: ^[^\*]*[\*]?[^\*]*$
- pattern: ^([^?]*[?]){0,8}[^?]*$IP address validation – examples
Valid IP address values (wildcards only working with operator Matches/MatchesNot):
1.1.1.1
100.100.100.100
100.100.1.*
100.1.*
.1
1..1
1.1..1
1.?.???.1
?.1.1.??
1.??.
Invalid IP address values:
1
1.1
1.1.1
1.01.1.1
1.1000.1.1
1.1.1*
.1.1.
1.**.1.1
???.???.???.1
1.????.1.1
Private or reserved IP addresses
Relay host validation regex pattern
Value matching for relay host addresses is NOT case-sensitive, so it doesn’t matter if you are using
capital or small letters.
Regex patterns
RelayHost:
type: string
minLength: 3
maxLength: 253
anyOf:
- allOf:
- pattern:
^([0-9a-zA-Z]([0-9a-zA-Z-]*[0-9a-zA-Z])?)(\.[0-9a-zA-Z]([0-9a-zA-Z-]*
[0-9a-zA-Z])?)*(\.[0-9a-zA-Z]*[a-zA-Z][0-9a-zA-Z]*)(\.)?(:(6[0-4][0-9]
{3}|65[0-4][0-9]{2}|655[0-2][0-9]|6553[0-5]|[1-5][0-9]{4}|[1-9][0-9]{0,3}
|0))?$
- not:
pattern:
^((localhost|.+\.retloc)(:(6[0-4][0-9]{3}|65[0-4][0-9]{2}|655[0-2][0-9]
|6553[0-5]|[1-5][0-9]{4}|[1-9][0-9]{0,3}|0))?)$
- allOf:
- pattern:
^((25[0-5]|2[0-4][0-9]|1?[1-9]?[0-9]|10[0-9])\.){3}(25[0-5]|2[0-4][0-9]
|1?[1-9]?[0-9]|10[0-9])(:(6[0-4][0-9]{3}|65[0-4][0-9]{2}|655[0-2][0-9]|6553
[0-5]|[1-5][0-9]{4}|[1-9][0-9]{0,3}|0))?$
- not:
pattern:
^(((0(\.[0-9]{1,3}){3})|(10(\.[0-9]{1,3}){3})|(100\.(6[4-9]|[7-9][0-9]
|1[0-1][0-9]|12[0-7])(\.[0-9]{1,3}){2})|(127(\.[0-9]{1,3}){3})|
(169\.254(\.[0-9]{1,3}){2})|(172\.(1[6-9]|2[0-9]|3[0-1])(\.[0-9]{1,3})
{2})|(192\.0\.0\.[0-9]{1,3})|(192\.0\.2\.[0-9]{1,3})|(192\.88\.99\.[0-9]
{1,3})|(192\.168(\.[0-9]{1,3}){2})|(198\.1[8-9](\.[0-9]{1,3}){2})|
(198\.51\.100\.[0-9]{1,3})|(203\.0\.113\.[0-9]{1,3})|((22[4-9]|2[3-4]
[0-9]|25[0-5])(\.[0-9]{1,3}){3}))(:(6[0-4][0-9]{3}|65[0-4][0-9]{2}|655
[0-2][0-9]|6553[0-5]|[1-5][0-9]{4}|[1-9][0-9]{0,3}|0))?)$Relay host validation – examples
Valid host name values:
http://test.de
foo.bar:25
subdomain.foobar.de:2525
example.com:77777
relay.rrr123.de
Any IP v4 address (without private or reserved IP addresses)
Invalid host name values:
test..de
http://subdomain.com
test.de:27847
.sdg.test.de:25
test:24