Function: imatch

The imatch() function evaluates whether a string matches a specified regular expression at the beginning of a string. It returns true if any part of the string matches the pattern, and false otherwise. The match will be case in-sensitive.

Regular expressions

Regular expressions provide powerful pattern matching capabilities. It's crucial to understand basic regex syntax when using this function. If you need to search for a pattern anywhere within a string, you must explicitly anchor your regular expression pattern to allow for characters at the beginning (e.g., using .*).

For case-sensitive matching, use the match() function instead.

Syntax:

<string>.imatch(<regular_expression>)

Example:

var.log_entry = "System Error[53]: Disk full."

// Test if error[X] is found, case in-sensitive
case var.log_entry.imatch(".*error\[\d+\]"):
    return WARNING, "Error found: @var.log_entry"