Creates a metric function that checks if the prediction contains
a specific substring or pattern.
Usage
metric_contains(pattern, field = NULL, ignore_case = FALSE, fixed = TRUE)
Arguments
- pattern
The pattern to search for (can be a regex)
- field
Optional field name to extract from structured outputs
- ignore_case
Logical, whether to ignore case
- fixed
Logical, whether pattern is a fixed string (not regex)
Value
A function with signature function(prediction, expected) -> logical
Examples
# Check for substring
metric <- metric_contains("positive", ignore_case = TRUE)
metric("The result is POSITIVE", NULL) # TRUE
#> [1] TRUE
# Regex pattern
metric <- metric_contains("\\d+", fixed = FALSE)
metric("The answer is 42", NULL) # TRUE
#> [1] TRUE
