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→Grouping '()' and grouping with alteration '(|)'
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== Grouping '<code>()</code>' and grouping with alteration '<code>(|)</code>' ==
Parentheses can be used to create bracketed regular expressions. The parentheses group the regular expression inside. The parentheses are not matched, only what is inside. Grouping offers alteration/choice represented by the pipe (|). When a grouped expression is followed by a quantifier such as the asterisk, the quantifier applies to the entire group Examples of grouping with and without alteration are:
<blockquote><code>grep</code> requires the <code>-E</code> option to enable grouping
</blockquote>
= Search and Replace in vi =
