Question

I need a regular expression to find all the lines that begins with /*

$num_queries =  preg_match_all(
    'REG_EXP',
    file_get_contents(__DIR__ . DIR_PLANTILLAS . '/' . 'temp_template.sql')
);

I try this '^\/\*.*' but it does not work.

Answer 1

If you use this string: /^\/\*.*/ in the preg_match() function, it’ll work. This pattern matches /* followed by maybe some text.
Make sure the regular expression will be performed on each line. I recommend that you first split the string (file contents) by a newline. You can use the function preg_split() in order to do so.

If you don’t want to split the file contents by each line first, then you can use the following pattern: /(^|\n)\/\*(.*)/. That pattern matches first either the beginning of the string or a newline, followed by /*, followed by maybe some text.

Notice that in the patterns /^\/\*.*/ and /(^|\n)\/\*(.*)/ the / is used as delimiter. That means that further occurences of / must be escaped.