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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Time and time again I see $1 and $2 being used in code. What does it mean? Can you please include examples?
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:
This will capture from
A90B3Cthe values90and3. 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:
Matching against the same string will capture
90B,90and3.