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<?php $string = "// blah blah blah\n\nconst filename = \"\";\n\n// blah blah blah"; echo preg_replace('~^(\h*const\s+filename\s*=\s*).+~mi', '$1"NEW VALUE";', $string);
Output for git.master, git.master_jit, rfc.property-hooks
// blah blah blah const filename = "NEW VALUE"; // blah blah blah

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