Fn::MatchPattern of Alibaba Cloud ROS - Resource Orchestration Service

The built-in function Fn::MatchPattern checks whether a value of the String type matches the condition in a regular expression. If the value matches the condition, true is returned. Otherwise, false is returned.

Declaration

JSON

{
  "Fn::MatchPattern": [
    pattern,
    value
  ]
}

YAML
- Syntax for the full function name:
```
Fn::MatchPattern: pattern, value
```
- Syntax for the short form:
```
!MatchPattern [pattern, value]
```

Parameters

pattern: Required. This parameter specifies a regular expression that is of the String type.
value: Required. This parameter specifies the value that you want to use to match the condition in the specified regular expression.

Return value

true or false.

Examples

```
Fn::MatchPattern:
 - '[a-z]+'
 - adb
```
In this example, true is returned.
```
Fn::MatchPattern:
 - '[a-z]+'
 - 12b
```
In this example, false is returned.