Jose Salazar Jose Salazar - 1 year ago 84
PHP Question

Replace one character with another using PHP function

I need to use a custom PHP function to process this 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 it so that it reads like 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 the following but is also replacing the character "|" between "Leander | Cedar Park". Is there a way to only replace the ones with no space before or after?

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

Any suggestions? Thanks!

Answer Source

What you're looking for is called a look ahead/behind assertion in PCRE. Specifically you want a negative look behind and negative look ahead for space surrounding your pipe. Also you should note that the character | has special meaning in PCRE so you need to escape it to get a literal.

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

The (?<! ) is a negative look-behind. It says match the character |, but only if it is not proceeded by a space. The (?! ) is the negative look ahead. It says match the character | but only if it is not followed by a space.

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