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copied!<p>You can use this</p> <pre><code>$result = preg_replace('/(?<=[a-z_])\s+(?=\d)|(?<=\d)\s+(?=[a-z_])/i', ',', $subject); </code></pre> <p><strong>Explanation</strong></p> <pre><code> # Match either the regular expression below (attempting the next alternative only if this one fails) (?<= # Assert that the regex below can be matched, with the match ending at this position (positive lookbehind) [a-z_] # Match a single character present in the list below # A character in the range between “a” and “z” # The character “_” ) \s # Match a single character that is a “whitespace character” (spaces, tabs, and line breaks) + # Between one and unlimited times, as many times as possible, giving back as needed (greedy) (?= # Assert that the regex below can be matched, starting at this position (positive lookahead) \d # Match a single digit 0..9 ) | # Or match regular expression number 2 below (the entire match attempt fails if this one fails to match) (?<= # Assert that the regex below can be matched, with the match ending at this position (positive lookbehind) \d # Match a single digit 0..9 ) \s # Match a single character that is a “whitespace character” (spaces, tabs, and line breaks) + # Between one and unlimited times, as many times as possible, giving back as needed (greedy) (?= # Assert that the regex below can be matched, starting at this position (positive lookahead) [a-z_] # Match a single character present in the list below # A character in the range between “a” and “z” # The character “_” ) </code></pre>

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