去除字符串内部的空行:
$str = preg_replace("/(\s*?\r?\n\s*?)+/","\n",$str);
去除全部的空行,包括内部和头尾:
$str = preg_replace('/($\s*$)|(^\s*^)/m', '',$str);
editplus中替换空白行的正则表达式:
正则表达式:^[\t\n ]*\n
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