By Theis T.
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It was a traumatic moment in a young boy's life. After that, I never liked Miss Smith, and have since been a very poor speler. Page 13 Without the parentheses, gra|ey means " gra or ey ", which is not what we want here. Alternation reaches far, but not beyond parentheses. Another example is (First|1st) [Ss]treet . Actually, since both First and 1st end with st , they can be shortened to (Fir |1)st [Ss]treet , but that's not necessarily quite as easy to read. Still, be sure to understand that they do mean the same thing.
Each building block is in itself quite simple, but since they can be combined in an infinite number of ways, knowing how to combine them to achieve a particular goal takes some experience. Don't get me wrong—regular expressions are not difficult to learn and use. In fact, by the end of this very chapter, you'll be able to wield them in powerful ways, even if this is your first real exposure to them. Still, as with anything, experience helps. With regular expressions, experience can provide a frame of mind, giving direction to one's thinking.
The very richness that allows the programmer to move quickly from concept to program can be a minefield for the uninitiated. This detailed chapter will clear a path. Page xx Typographical Conventions When doing (or talking about) detailed and complex text processing, being precise is important. The mere addition or subtraction of a space can make a world of difference, so I use the following special conventions: • A regular expression generally appears like this . " Literal text (such as that being searched) generally appears like 'this'.