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→Literal (Simple) Regular Expressions
[[Image:re-3.png|thumb|right|200px|A '''simple''' ('''literal''') regular expression is a series of letters and numbers (tabs or spaces).]]
The simplest regular expression is a series of letters and numbers, (tabs or spaces). <br>A '''simple''' ('''literal''') regular expression consists of normal characters, which used to match patterns.<br><br>
Although there are many Linux commands that use regular expressions, the '''grep''' command is a useful command to learn how to display matches of patterns of strings within text files.<br><br>
For example: