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Use the source, Luke.
regex prefix_circumfix_meta_operator:reduce (--> List_prefix) { $<s> = ( '[' [ | <op=infix> ']' [''|<?>] | <op=infix_prefix_meta_operator> ']' [''|<?>] | <op=infix_circumfix_meta_operator> ']' [''|<?>] | \\<op=infix> ']' [''|<?>] | \\<op=infix_prefix_meta_operator> ']' [''|<?>] | \\<op=infix_circumfix_meta_operator> ']' [''|<?>] ] ) <?before \s | '(' > ...

So [\ is really a handled specially.

Or if you're not inclined to read the source, you can examine the match tree:

$ cat test.t [\~] 1..3 $ perl5.10.0 STD5_dump_match test.t comp_unit: statementlist: statement: EXPR: left: pre: prefix_circumfix_meta_operator: [\ op: ~ ] noun: value: number: integer: 1 infix: .. right: noun: value: number: integer: 3 \n
The output in a terminal is coloured, and much better readable. Basically you see that [\ is matched as a prefix_circumfix_meta_operator with the op: ~

In reply to Re^4: Generate the perl sequence 1, 11, 111, .... by moritz
in thread Generate the perl sequence 1, 11, 111, .... by alih110

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