In single-quoted literals, escaping \ is optional if it's not followed by \ or the string delimiter. 

$x = 'a\b';   print("$x\n");
$x = 'a\\b';  print("$x\n");

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a\b
a\b

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In reply to Re^3: Regex problem by ikegami
in thread Regex problem by siraj

Title:
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