Dell 6.2 manual Regular Expression Repetition Operators, Regular Expression Anchors

Table 350: Character-matching operators in regular expressions

Operator	Description	Sample	Result
.	Match any one character.	grep .ord sample.txt	Matches ford, lord, 2ord, etc. in the
			file sample.txt.
[ ]	Match any one character listed	grep [cng]ord sample.txt	Matches only cord, nord, and gord
	between the brackets
[^]	Match any one character not listed	grep [^cn]ord sample.txt	Matches lord, 2ord, etc., but not
	between the brackets		cord or nord
		grep [a-zA-Z]ord sample.txt	Matches aord, bord, Aord, Bord, etc.
		grep [^0-9]ord sample.txt	Matches Aord, aord, etc., but not
			2ord, etc.

Regular Expression Repetition Operators

Repetition operators are quantifiers that describe how many times to search for a specified string. Use them in conjunction with the character-matching operators in Table 351 to search for multiple characters.

Table 351: Regular expression repetition operators

Operator	Description	Sample	Result
?	Match any character one time if	egrep “?erd” sample text	Matches berd, herd, etc., erd
	it exists
*	Match declared element multiple	egrep “n.*rd” sample.txt	Matches nerd, nrd, neard, etc.
	times if it exists
+	Match declared element one or	egrep “[n]+erd” sample.txt	Matches nerd, nnerd, etc., but not
	more times		erd
{n}	Match declared element exactly	egrep “[a-z]{2}erd” sample.txt	Matches cherd, blerd, etc., but not
	n times		nerd, erd, buzzerd, etc.
{n,}	Match declared element at least	egrep “.{2,}erd” sample.txt	Matches cherd and buzzerd, but not
	n times		nerd
{n,N}	Match declared element at least	egrep “n[e]{1,2}rd” sample.txt	Matches nerd and neerd
	n times, but not more than N
	times

Regular Expression Anchors

Anchors describe where to match the pattern, and are a handy tool for searching for common string combinations. Some of the anchor examples use the vi line editor command :s, which stands for substitute. That command uses the syntax: s/pattern_to_match/pattern_to_substitute.

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