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<?php $string = "I need to replace = in string with == sign, but not in <=, != and >= signs."; echo preg_replace('/(?<![<>=!])=(?!=)/', '==', $string);
Output for git.master, git.master_jit, rfc.property-hooks
I need to replace == in string with == sign, but not in <=, != and >= signs.

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