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| Metacharacter | Description | | |
+-----------------+----------------------------------------------------------------------------------------------------------+ | |
| \ | Specifies the next character as either a special character, literal, back reference, or an octal escape. | | |
| ^ | Matches the position at the beginning of the input string. | | |
| $ | Matches the position at the end of the input string. | | |
| * | Matches the preceding subexpression zero or more times. | | |
| + | Matches the preceding subexpression one or more times. | | |
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