July 2017
Beginner to intermediate
486 pages
13h 49m
English
Content preview from Python Natural Language Processing
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Positive lookbehind
Positive lookbehind matches the substring from a string if the defined pattern is preceded by the substring. Refer to the following example:
- Consider the sentence: I play on the playground. It is the best ground.
- Now you want to extract ground, if it is preceded by the string play. In this case, you can use positive lookbehind.
The syntax of positive lookbehind is (?<=pattern)
The regex r(?<=play)ground matches ground, but only if it is preceded by play.
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I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.