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178 \] |
178 \] |
179 |
179 |
180 \noindent Note also that the convention in Scala is that |
180 \noindent Note also that the convention in Scala is that |
181 \texttt{.r} converts a string into a regular expression. I |
181 \texttt{.r} converts a string into a regular expression. I |
182 leave it to you to ponder whether this regular expression |
182 leave it to you to ponder whether this regular expression |
183 really captures all possible web-addresses. |
183 really captures all possible web-addresses. If you need a quick |
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184 recap about regular expressions, here is a quick video |
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185 \url{https://youtu.be/bgBWp9EIlMM}. |
184 |
186 |
185 \subsection*{Why Study Regular Expressions?} |
187 \subsection*{Why Study Regular Expressions?} |
186 |
188 |
187 Regular expressions were introduced by Kleene in the 1950ies and they |
189 Regular expressions were introduced by Kleene in the 1950ies and they |
188 have been object of intense study since then. They are nowadays pretty |
190 have been object of intense study since then. They are nowadays pretty |