Regular expression for preg_replace

Can you help me please开发者_JAVA百科 what is the regular expression for this string change in preg_replace?

from "On the day, he is playing" to "he is good to play".

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preg_replace("/On the day, he is playing/", "he is good to play", $input);

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If you want to replace anything coming after the last comma "," in a string, try this:

preg_replace("/[^,]*$/", " he is good to play", $input, 1);