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    Regular expression to work with PHP


    I have this regular expression which works in Sublime Text editor:

    \n^[ ]{3}$

    What it does is match 2 lines:

    on the first line it matches the end of the line (so basically any line with string will do)
    on the second line it must have 3 spaces and nothing else (if it has 3 spaces and text or 4 spaces and nothing - does not match the pattern).

    Unfortunately when I try to apply this pattern in PHP the output is still kept unchanged. I figured PHP did not understand the reg ex.
    I tried to create different variations of the same pattern but PHP either complained about an error or simply outputted the result unchanged.

    For simplicity, consider the following text file:

    UID(AB55*****A33921) ALLOW
    UID(CD57428**B9000G) ALLOW

    UID(DE57428**R9000H) ALLOW
    UID(LT57945**B59649) ALLOW

    3rd line contains 3 spaces. The command I issue is this:

    $result = preg_replace("\n^[ ]{3}$^", '', $file); //had to throw ^ to avoid No ending delimiter '^' found

    This command should remove (replace) new line and 3 spaces into nothing. In other words - remove empty lines with 3 spaces so each line contains something.

    Any ideas?
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    Devshed Supreme Being (6500+ posts)

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    PHP's PCRE functions require delimiters because that first argument is both the regex and any flags you want to apply. A slash is fairly standard.
    PHP Code:
    preg_replace('/\n^[ ]{3}$/'

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