@@ -649,94 +649,98 @@ This follows the usual rules for [`only` / `except` policies](../yaml/README.md#
### Syntax of environment variable expressions
Below you can find supported syntax reference:
Below you can find supported syntax reference.
1. Equality matching using a string
#### Equality matching using a string
Examples:
Examples:
-`$VARIABLE == "some value"`
-`$VARIABLE != "some value"` (introduced in GitLab 11.11)
-`$VARIABLE == "some value"`
-`$VARIABLE != "some value"` (introduced in GitLab 11.11)
You can use equality operator `==` or `!=` to compare a variable content to a
string. We support both, double quotes and single quotes to define a string
value, so both `$VARIABLE == "some value"` and `$VARIABLE == 'some value'`
are supported. `"some value" == $VARIABLE` is correct too.
You can use equality operator `==` or `!=` to compare a variable content to a
string. We support both, double quotes and single quotes to define a string
value, so both `$VARIABLE == "some value"` and `$VARIABLE == 'some value'`
are supported. `"some value" == $VARIABLE` is correct too.
1. Checking for an undefined value
#### Checking for an undefined value
Examples:
Examples:
-`$VARIABLE == null`
-`$VARIABLE != null` (introduced in GitLab 11.11)
-`$VARIABLE == null`
-`$VARIABLE != null` (introduced in GitLab 11.11)
It sometimes happens that you want to check whether a variable is defined
or not. To do that, you can compare a variable to `null` keyword, like
`$VARIABLE == null`. This expression evaluates to true if
variable is not defined when `==` is used, or to false if `!=` is used.
It sometimes happens that you want to check whether a variable is defined
or not. To do that, you can compare a variable to `null` keyword, like
`$VARIABLE == null`. This expression evaluates to true if
variable is not defined when `==` is used, or to false if `!=` is used.
1. Checking for an empty variable
#### Checking for an empty variable
Examples:
Examples:
-`$VARIABLE == ""`
-`$VARIABLE != ""` (introduced in GitLab 11.11)
-`$VARIABLE == ""`
-`$VARIABLE != ""` (introduced in GitLab 11.11)
If you want to check whether a variable is defined, but is empty, you can
simply compare it against an empty string, like `$VAR == ''` or non-empty
string `$VARIABLE != ""`.
If you want to check whether a variable is defined, but is empty, you can
simply compare it against an empty string, like `$VAR == ''` or non-empty
string `$VARIABLE != ""`.
1. Comparing two variables
#### Comparing two variables
Examples:
Examples:
-`$VARIABLE_1 == $VARIABLE_2`
-`$VARIABLE_1 != $VARIABLE_2` (introduced in GitLab 11.11)
-`$VARIABLE_1 == $VARIABLE_2`
-`$VARIABLE_1 != $VARIABLE_2` (introduced in GitLab 11.11)
It is possible to compare two variables. This is going to compare values
of these variables.
It is possible to compare two variables. This is going to compare values
of these variables.
1. Variable presence check
#### Variable presence check
Example: `$STAGING`
Example: `$STAGING`
If you only want to create a job when there is some variable present,
which means that it is defined and non-empty, you can simply use
variable name as an expression, like `$STAGING`. If `$STAGING` variable
is defined, and is non empty, expression will evaluate to truth.
`$STAGING` value needs to be a string, with length higher than zero.
Variable that contains only whitespace characters is not an empty variable.
If you only want to create a job when there is some variable present,
which means that it is defined and non-empty, you can simply use
variable name as an expression, like `$STAGING`. If `$STAGING` variable
is defined, and is non empty, expression will evaluate to truth.
`$STAGING` value needs to be a string, with length higher than zero.
Variable that contains only whitespace characters is not an empty variable.
1. Pattern matching (introduced in GitLab 11.0)
#### Regex pattern matching
Examples:
> [Introduced](https://gitlab.com/gitlab-org/gitlab-foss/-/issues/43601) in GitLab 11.0
-`=~`: True if pattern is matched. Ex: `$VARIABLE =~ /^content.*/`
-`!~`: True if pattern is not matched. Ex: `$VARIABLE_1 !~ /^content.*/` ([Introduced](https://gitlab.com/gitlab-org/gitlab-foss/-/issues/61900) in GitLab 11.11)
Examples:
Variable pattern matching with regular expressions uses the
-`=~`: True if pattern is matched. Ex: `$VARIABLE =~ /^content.*/`
-`!~`: True if pattern is not matched. Ex: `$VARIABLE_1 !~ /^content.*/` ([Introduced](https://gitlab.com/gitlab-org/gitlab-foss/-/issues/61900) in GitLab 11.11)
- Matches are found when using `=~`.
- Matches are *not* found when using `!~`.
Variable pattern matching with regular expressions uses the
