Language An alphabet \(\Sigma\) is a finite set of symbols, for example \(\Sigma=\{0,1\}\). A string is a finite sequence of symbols from \(\Sigma\). We denote the empty string by \(\epsilon\). The set of all strings over \(\Sigma\) is \(\Sigma^\star\), using…
Regular Expression Basics Regular expressions (regex) are an effective way of describing common patterns in strings. For example, all phone numbers in North America have 10 digits; this can be easily described by regular expressions: [0-9]{10}, which matches with 10…