Slides - University of Washington
Slides - University of Washington
Slides - University of Washington
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<strong>University</strong> <strong>of</strong> <strong>Washington</strong><br />
Ling472 Introduction to Computational Linguistics<br />
Lecture 1:<br />
Introduction<br />
More RegEx<br />
* accepts zero or more <strong>of</strong> the preceding element<br />
this is the canonical ‘greedy’ operator<br />
? accepts zero or one <strong>of</strong> the preceding element(s)<br />
+ accepts one or more <strong>of</strong> the preceding element(s)<br />
{n} accepts n <strong>of</strong> the preceding element(s)<br />
{n,} accepts n or more <strong>of</strong> the preceding element(s)<br />
{n,m} accepts n to m <strong>of</strong> the preceding element(s)<br />
(pattern)<br />
defines a capture group which can be referred to<br />
later via \1<br />
Monday, April 1, 2013<br />
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