dsa1230000 2012-11-08 23:48
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正则表达式从字符串中删除所有单个字符

I need a Regular Expression to remove ALL single characters from a string, not just single letters or numbers

The string is:

"A Future Ft Casino Karate Chop ( Prod By Metro )"

it should come out as:

"Future Ft Casino Karate Chop Prod By Metro"

The expression I am using at the moment (in PHP), correctly removes the single 'A' but leaves the single '(' and ')'

This is the code I am using:

$string = preg_replace('/\b\w\b\s?/', '', $string); 
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  • doufen5175 2012-11-08 23:59
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    Try this:

    (^| ).( |$)
    

    Breakdown:

       1.  (^| )  ->  Beginning of line or space  
       2.  .      ->  Any character  
       3.  ( |$)  ->  Space or End of line
    

    Actual code:

    $string = preg_replace('/(^| ).( |$)/', '$1', $string); 
    

    Note: I'm not familiar with the workings of PHP regex, so the code might need a slight tweak depending on how the actual regex needs declared.

    As m.buettner pointed out, there will be a trailing white space here with this code. A trim would be needed to clear it out.

    Edit: Arnis Juraga pointed out that this would not clear out multiple single characters a b c would filter out to b. If this is an issues use this regex:

    (^| ).(( ).)*( |$)
    

    The (( ).)* added to the middle will look for any space following by any character 0 or more times. The downside is this will end up with double spaces where a series of single characters were located.

    Meaning this:

    The a b c dog
    

    Will become this:

    The  dog
    

    After performing the replacement to get single individual characters, you would need to use the following regex to locate the double spaces, then replace with a single space

    ( ){2}
    
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