String Operators
String operators provide functionality for string manipulation and comparison in DataLogic-rs rules.
cat
The cat operator concatenates multiple strings together.
Syntax
{ "cat": [string1, string2, ...] }Parameters
| Parameter | Description |
|---|---|
| strings | An array of strings or expressions that evaluate to strings |
Example: Simple String Concatenation
Rule:
Data:
Result:
Example: Concatenation with Variables
Rule:
Data:
Result:
substr
The substr operator extracts a substring from a string, starting at a specified position
and optionally extracting a specified number of characters.
Syntax
{ "substr": [string, start_index, length] }Parameters
| Parameter | Description |
|---|---|
| string | The input string to extract from |
| start_index | The start position (0-indexed) |
| length (optional) | The number of characters to extract (if omitted, extracts until end of string) |
Example: Extract Substring
Rule:
Data:
Result:
Example: Extract to End of String
Rule:
Data:
Result:
starts_with
The starts_with operator checks if a string starts with a specified prefix.
Syntax
{ "starts_with": [string, prefix] }Parameters
| Parameter | Description |
|---|---|
| string | The string to check |
| prefix | The prefix to look for at the start of the string |
Example: Check if string starts with prefix
Rule:
Data:
Result:
Example: Case sensitivity
Rule:
Data:
Result:
ends_with
The ends_with operator checks if a string ends with a specified suffix.
Syntax
{ "ends_with": [string, suffix] }Parameters
| Parameter | Description |
|---|---|
| string | The string to check |
| suffix | The suffix to look for at the end of the string |
Example: Check if string ends with suffix
Rule:
Data:
Result:
Example: Using with conditional
Rule:
Data:
Result:
upper
The upper operator converts a string to uppercase.
Syntax
{ "upper": string }Parameters
| Parameter | Description |
|---|---|
| string | The string to convert to uppercase |
Example: Convert string to uppercase
Rule:
Data:
Result:
Example: Combining with other operators
Rule:
Data:
Result:
lower
The lower operator converts a string to lowercase.
Syntax
{ "lower": string }Parameters
| Parameter | Description |
|---|---|
| string | The string to convert to lowercase |
Example: Convert string to lowercase
Rule:
Data:
Result:
Example: Case-insensitive comparison
Rule:
Data:
Result:
trim
The trim operator removes whitespace characters from the beginning and end of a string.
Syntax
{ "trim": string }Parameters
| Parameter | Description |
|---|---|
| string | The string to trim |