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Regular Expression Special Variables in Perl
There are various Regular Expression Special Variables in Perl. We have listed them in different below in tabular form −
| $digit | Contains the text matched by the corresponding set of parentheses in the last pattern matched. For example, $1 matches whatever was contained in the first set of parentheses in the previous regular expression. |
| $& | The string matched by the last successful pattern match. |
| $MATCH | |
| $` | The string preceding whatever was matched by the last successful pattern match. |
| $PREMATCH | |
| $' | The string following whatever was matched by the last successful pattern match. |
| $POSTMATCH | |
| $+ | The last bracket matched by the last search pattern. This is useful if you don't know which of a set of alternative patterns was matched. For example : /Version: (.*)|Revision: (.*)/ && ($rev = $+); |
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