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what is the difference between double and single quotes in regex


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What is the difference between the two? Tried for hours to fix this and don't know exactly the reasons it works.

 


preg_replace("/\$inc\s+\(([^\)]+)\)/im", $replace, $subject); // Breaks - single quotes

preg_replace('/\$inc\s+\(([^\)]+)\)/im', $replace, $subject); // Works - double quotes

To escape a dollar sign (followed by one or more characters allowed in variable names) inside double quotes in a preg_* call, you actually need three backslashes. The first one suppresses the variable meaning, the second escapes the first backslash, and then you need a third to suppress the regex meaning ($ being the end-of-string char in regex).

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