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How to extract strings from a file
Matching numbers using Perl regex
${^WARNING_BITS}
${^MATCH}
$^D
${^LAST_FH}
${^UTF8LOCALE}
$^P
$^I
${^POSTMATCH}
$^C
$^L
$^
${^GLOBAL_PHASE}
$^O $OSNAME
${^TAINT}
$^W
${^RE_DEBUG_FLAGS}
${^UNICODE}
${^RE_TRIE_MAXBUF}