Regular Expressions (REGEX)

Regex is a useful tool that settle has support for, because it provides wildcards and patterns which allow matching multiple strings. See this regular expression specification for all supported patterns. But here are a few of the most useful characters you're going to use:

• . - match any single character
• * - match the previous character zero or more times
• + - match the previous character one or more times

If you wanted to match a literal ., * or +, you'd have to escape them with a backslash: \., \* and \+ respectively.

Here are some examples:

• .* matches anything, even empty strings
• f+ matches the character f one or more times
• .*foo.* matches any string containing the word foo