php - Replace all dot only in string, but not in numeric values -

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i want replace occurrence of dot (.) in string not digits or numeric value. have given example 

string : 10.10.2015 11.30 09/2007 83 hello.how.are.you $.### output : 10.10.2015 11.30 09/2007 83 hello how $ ###

i tried using preg_replace in php

use non-capturing lookbehind group test if previous character digit or not

$string = '10.10.2015 11.30 09/2007 83 hello.how.are.you $.###'; $result = preg_replace('/(?<=[^\d])\./', ' ', $string); var_dump($result);

explanation

(?<=[^\d])\.  -------- --      ^    ^      |    |      |    ------------------  escape `.` we're working literal      |                          dot rather "any character"      |      -----------------------  preceding non-digit character                                 don't include in replace group

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