PHP Use Regex to match whitespace as well as empty characters

Question

I'll start off with some code, this is my current setup:

$search = [ '/\{\{\sSTRING\s\}\}/is', '/\{\{STRING\}\}/is' ]; $replace = [ '<b>TEST_STRING</b>', '<b>TEST_STRING</b>' ]; echo preg_replace( $search, $replace, "{{STRING}}" );

This would then output TEST_STRING, as wanted, but I'm using two REGEX statements to make this work, and I want this to work with strings like {{ STRING }} as well as {{STRING}} by only using a single REGEX.

I thought the statement would also ignore there being whitespace, but the \s statement specifically looks for anything relating to [\r\n\t\f\v ], is there an expression to use that will ignore whitespace as well as include it?

I think this would help you: stackoverflow.com/questions/18065807/… — jaya chandra
– jaya chandra, Commented Jan 8, 2017 at 4:16

dobaniashish · Accepted Answer · 2017-01-08 04:22:36Z

You can add an optional quantifier "?" after whitespace character "\s".

$search = '/\{\{\s?STRING\s?\}\}/is'; $replace = '<b>TEST_STRING</b>'; echo preg_replace( $search, $replace, "{{STRING}}" );

Hope this helps.

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