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→Extended Regular Expressions
Examples of how to use these complex regular expressions with the grep command are displayed below:
<table align="left"><tr valign="top"><td>[[Image:re-8.png|thumb|right|220px|Example of using repetition.]]</td><td>[[Image:re-29.png|thumb|right|200px220px|Example of using grouping.]]</td><td>[[Image:re-1.png|thumb|right|300px|Example of using or condition with grouping.]]</td></tr></table>
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