If you are using Amazon Lex V2, refer to the Amazon Lex V2 guide instead.
If you are using Amazon Lex V1, we recommend upgrading your bots to Amazon Lex V2. We are no longer adding new features to V1 and strongly recommend using V2 for all new bots.
AMAZON.AlphaNumeric
Recognizes strings made up of letters and numbers, such as
APQ123.
This slot type is not available in the Korean (ko-KR) locale.
You can use the AMAZON.AlphaNumeric slot type for
strings that contain:
-
Alphabetical characters, such as
ABC -
Numeric characters, such as
123 -
A combination of alphanumeric characters, such as
ABC123
You can add a regular expression to the
AMAZON.AlphaNumeric slot type to validate
values entered for the slot. For example, you can use a regular
expression to validate:
-
United Kingdom or Canadian postal codes
-
Driver's license numbers
-
Vehicle identification numbers
Use a standard regular expression. Amazon Lex supports the following characters in the regular expression:
-
A-Z, a-z
-
0-9
Amazon Lex also supports Unicode characters in regular expressions.
The form is \u.
Use four digits to represent Unicode characters. For example,
Unicode[\u0041-\u005A] is equivalent to [A-Z].
The following regular expression operators are not supported:
-
Infinite repeaters: *, +, or {x,} with no upper bound.
-
Wild card (.)
The maximum length of the regular expression is 300 characters. The maximum length of a string stored in an AMAZON.AlphaNumeric slot type that uses a regular expression is 30 characters.
The following are some example regular expressions.
-
Alphanumeric strings, such as
APQ123orAPQ1:[A-Z]{3}[0-9]{1,3}or a more constrained[A-DP-T]{3} [1-5]{1,3} -
US Postal Service Priority Mail International format, such as
CP123456789US:CP[0-9]{9}US -
Bank routing numbers, such as
123456789:[0-9]{9}
To set the regular expression for a slot type, use the console or the PutSlotType operation. The regular expression is validated when you save the slot type. If the expression isn't valid, Amazon Lex returns an error message.
When you use a regular expression in a slot type, Amazon Lex checks input to slots of that type against the regular expression. If the input matches the expression, the value is accepted for the slot. If the input does not match, Amazon Lex prompts the user to repeat the input.
