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<?php $string = 'The story is inspired by the Operation Batla House that took place in 2008 '; $tag = '2.0'; $pattern = '/(\s|^)'.preg_quote($tag, '/').'(?=[^a-z^A-Z])/i'; echo preg_replace($pattern, '2.0', $string);
Output for git.master, git.master_jit, rfc.property-hooks
The story is inspired by the Operation Batla House that took place in 2008

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