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/ 13 Years ago, thu, may 12, 2011, 12:00:00
Time and time again I see $1 and $2 being used in code. What does it mean? Can you please include examples?
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When you create a regular expression you have the option of capturing portions of the match and saving them as placeholders. They are numbered starting at $1.
For instance:
/A(d+)B(d+)C/
This will capture from A90B3C the values 90 and 3. If you need to group things but don't want to capture them, use the (?:...) version instead of (...).
The numbers start from left to right in the order the brackets are open. That means:
/A((d+)B)(d+)C/
Matching against the same string will capture 90B, 90 and 3.
[#92270] Wednesday, May 11, 2011, 13 Years
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answered 13 Years ago
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