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→Extended Regular Expressions
:*'''Repetition: {min,max}'''<br>Allows for more precise repetitions. Using braces, you can specify<br>the '''minimum''' and/or '''maximum''' number of repetitions.
:*'''Grouping: ( )'''<br>Perhaps you want to search for repetition for a group of characters, a word, or a phase.<br>You can enclose them within brackets ( ) to specify a group.
Examples of how to use these complex regular expressions with the grep command are displayed below:<br><br>