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How to extract strings from a file
Matching numbers using Perl regex
$^R
${^TAINT}
$^E
${^POSTMATCH}
$^S
${^UNICODE}
${^RE_TRIE_MAXBUF}
$^D
${^UTF8LOCALE}
$^V
${^ENCODING}
${^RE_DEBUG_FLAGS}
$^O $OSNAME
$^T
${^MATCH}
$^M
$^I
${^WARNING_BITS}