regex - Replace one character with another using PHP function -


i need use custom php function process data, 

austin metro>central austin|austin metro>georgetown|austin metro>lake travis | westlake|austin metro>leander | cedar park|austin metro>round rock | pflugerville | hutto|austin metro>southwest austin

and convert reads this:

austin metro>central austin#austin metro>georgetown#austin metro>lake travis | westlake#austin metro>leander | cedar park#austin metro>round rock | pflugerville | hutto#austin metro>southwest austin

currently using following replacing character "|" between "leander | cedar park". there way replace ones no space before or after? 

 preg_replace("/|/", "#", {categories[1]} );

any suggestions? thanks!

what you're looking called ahead/behind assertion in pcre. want negative behind , negative ahead space surrounding pipe. should note character | has special meaning in pcre need escape literal.

preg_replace('/(?<! )\|(?! )/', '#', $str);

the (?<! ) negative look-behind. says match character |, if not proceeded space. (?! ) negative ahead. says match character | if not followed space.


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