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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 7.1.25 - 7.1.31, 7.2.0 - 7.2.33, 7.3.0 - 7.3.33, 7.4.0 - 7.4.33, 8.0.0 - 8.0.30, 8.1.0 - 8.1.33, 8.2.0 - 8.2.29, 8.3.0 - 8.3.25, 8.4.1 - 8.4.12
I need to replace == in string with == sign, but not in <=, != and >= signs.

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128.89 ms | 407 KiB | 5 Q