> ## Documentation Index
> Fetch the complete documentation index at: https://docs.finwatch.finance/llms.txt
> Use this file to discover all available pages before exploring further.

# Conditions

A **Condition** is a logical test that evaluates to either `true` or `false`. Conditions are defined within the `when` block of a rule. A rule's action is only triggered if the entire set of conditions in the `when` block evaluates to `true`.

Conditions can be simple comparisons or complex, stateful checks, and they can be combined using logical operators.

**Structure & Examples:**

**Simple Comparison:** A direct comparison between a transaction field and a static value.

```shellscript theme={null}
when
    amount > 10000 and currency == "USD"
...
```

**List Membership:** Checks if a field's value is present in a predefined list

```shellscript theme={null}
when
    destination.country in ("NG", "GH", "KE")
...
```

\*\* Regular Expressions:\*\* Matches a field's value against a regex pattern

```shellscript theme={null}
when
    source.account_number regex "^(0|234)?[789][01]\\d{8}$"
.....
```