Regular expressions for searching and filtering modules

You can use regular expressions when you search or filter formal modules.

Table 1. Regular expressions
	Meaning	Example	Matches
*	Zero or more occurrences	`a*`	Zero or more `a` characters (every string matches this expression)
+	One or more occurrences	`a+`	One or more `a` characters
.	Any single character except newline	`*`	Any number of any characters except for newline characters (in other words, any string)
\	Escape (turns off the special meaning associated with a character)	`\.`	A period (.) character
^	Beginning of line (if it is at the start of the expression)	`^The.*`	Any line that starts with the string `The`
$	End of line (if it is at the end of the expression)	`Monday\.$`	Any line that ends with the string `Monday` followed by a period (.)
()	Groupings	`(ref)+(bind)*`	At least one ref string then zero or more bind strings
[]	character range (letters or digits)	`[sS]hall.*\.$`	Any line that contains either `shall` or `Shall`, and ends with a period (.)
		`[^abc]`	Any character except `a`, `b`, or `c`
		`[a-zA-Z]`	Any alphabetic character (uppercase or lowercase)
		`[0-9]`	Any numeric character (number between 0 and 9)
\|	alternative	`(dat\|doc)`	Either the string `dat` or the string `doc`