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→Literal (Simple) Regular Expressions
[[Image:re-3.png|thumb|right|200px|The simplest regular expression is a series of letters and numbers, possibly including white space (tabs or space characters).]]
The simplest regular expression is a series of letters and numbers, possibly including white space (tabs or space characters), that have no special meaning. Such a A '''simple''' regular expression consists of ``'''literals'''; that is, normal letters, which match only an identical letter in the data being searched.<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: