php 正则表达式常用例子

$arr_date = array(
'2004-06-01',
'2005-0x-10',
'12-12-12',
'2000-12-25 00:10:20',
'2007-12-05'
);

for ($i=0; $i<5; ++$i)
{
$date = $arr_date[$i];
if(ereg("([0-9]{4})-([0-9]{1,2})-([0-9]{1,2})", $date, $regs))
{
echo "日期字符串$date 符合'yyyy-mm-dd'格式：";
echo "$regs[1].$regs[2].$regs[3]

";
}
else
{
echo "日期字符串$date 不符合'yyyy-mm-dd'格式的日期字符串

";
}
}

$arr_str = array(
'python',
'php',
'perl',
'ruby'
);

for($i=0; $i<4; ++$i)
{
$str = $arr_str[$i];
if(eregi('p|h', $str))
{
echo "'$str' 含有p、p、h或h

";
}
else
{
echo "'$str' 不含 p、p、h或h

";
}

if(ereg('p',$str))
{
echo "在ereg()中 '$str' 匹配'p'

";
}
else
{
echo "在ereg()中 '$str' 不匹配'p'

";
}
}

$str = "1fish2fish3fish4fish5fish";
echo "替换前字符串为：
";
echo $str;
echo "
";
echo "
";

$str_rpc = ereg_replace("[0-9]", " ", $str);
echo "替换后字符串为：
";
echo $str_rpc;

$str = "you have a car, i have a car, we have cars!";
echo "替换前字符串为：
";
echo $str;
echo "
";
echo "
";

$pattern = "car";
$replacement = "apple";
$str_rpc = eregi_replace($pattern, $replacement, $str);
echo "替换后字符串为：
";
echo $str_rpc;

$str = "aaa~bbb~ccc~ddd";
echo "字符串截取前：$str";
echo "
";
echo "
";

$sep_arr = split("~",$str);
echo "字符串截取后：
";
echo "

";

print_r($sep_arr);

 

$str = "aaaaaaa~bbbbc~dccce~fdddzzz";
echo "字符串截取前：
$str";
echo "
";
echo "
";

$sep_arr = split("[a-z]{3}",$str);
echo "使用aaa，bbb，ccc，ddd做分割字符串后：";
echo "

";

print_r($sep_arr);

 

$str = "k#v3050";
echo "原字符串：
$str";
echo "
";
echo "
";

$reg_str = sql_regcase ($str);
echo "使用函数sql_regcase()生成的正则表达式为：";
echo "
";
echo $reg_str;

$test_preg = array(
"ak47",
"163.com",
"happy new year!",
"ex0000",
"007 in usa",
"abc123",
"test-abc-315",
"123654789",
"euapa00!"
);

echo "原数组：";
echo "

";

print_r($test_preg);

echo "

$preg_arr = preg_grep("/^[a-z].*[0-9]$/",$test_preg);
echo "
";
echo "将原数组中以任意大写字母开头的、中间任意个字符、最后以数字结尾的字符串找出：";
echo "

";

print_r($preg_arr);

echo "

$str_arr = array(
"php 是优秀的web脚本语言",
"perl的文本处理功能很强大"
);

foreach($str_arr as $str)
{
//模式定界符后面的修正符"i" 表示匹配时不区分大小写字母
if(preg_match("/php/i", $str))
{
echo "在字符串' $str '中找到对'php'的匹配";
echo "
";
echo "
";
}
else
{
echo "在字符串' $str '中未找到对'php'的匹配";
echo "
";
echo "
";
}
}

$html = "粗体字符可点击的连接";

preg_match_all ("/(<([w]+)[^>]*>)(.*)()/", $html, $matches);

for ($i=0; $i< count($matches[0]); $i++)
{
echo "匹配：".$matches[0][$i]." ";;
echo "第一部分：".$matches[1][$i]." ";
echo "第二部分：".$matches[3][$i]." ";
echo "第三部分：".$matches[4][$i]." ";
}

$string = "the quick brown fox jumped over the lazy dog.";
echo "原字符串：
";
echo $string;
echo "

";

$patterns[0] = "/quick/";
$patterns[1] = "/brown/";
$patterns[2] = "/fox/";

$replacements[2] = "bear";
$replacements[1] = "black";
$replacements[0] = "slow";

$str1 = preg_replace($patterns, $replacements, $string);
echo "使用函数ksort()之前字符串替换为：
";
echo $str1;
echo "

";

ksort($patterns);
ksort($replacements);

$str2 = preg_replace($patterns, $replacements, $string);
echo "使用函数ksort()之前字符串替换为：
";
echo $str2;
echo "

";

$str = 'php language programming in web';
echo "原字符串：
";
echo $str;
echo "

";

$chars = preg_split('/ /', $str, -1, preg_split_offset_capture);
echo "调用函数preg_split()后：";
echo "

";

print_r($chars);

 

$arr_ip = array(
"127.0.0.1",
"218.206.10.123",
"192.221.515.0",
"123.0.0.0.1",
"-12.255.0.10",
"10.9c.132.69",
"255.10.10.255"
);

foreach ($arr_ip as $ip)
{
if(validateip($ip))
{
echo "$ip 是正确的ip地址";
echo "

";
}
else
{
echo "$ip 不是正确的ip地址";
echo "

";
}
}

function validateip($ip)
{
$iparray = explode(".",$ip);
for($i=0;$i {
if($iparray[$i]>255)
return (0);
}
return ereg("[0-9]{1,3}.[0-9]{1,3}.[0-9]{1,3}.[0-9]{1,3}",$ip);
}

$arr_ip = array(
"127.0.0.1",
"218.206.10.123",
"192.221.515.0",
"123.0.0.0.1",
"-12.255.0.10",
"10.9c.132.69",
"255.10.10.255"
);

foreach ($arr_ip as $ip)
{
if(validateip($ip))
{
echo "$ip 是正确的ip地址";
echo "

";
}
else
{
echo "$ip 不是正确的ip地址";
echo "

";
}
}

function validateip($ip)
{
$iparray = explode(".",$ip);
for($i=0;$i {
if($iparray[$i]>255)
return (0);
}
return ereg("^[0-9]{1,3}.[0-9]{1,3}.[0-9]{1,3}.[0-9]{1,3}$",$ip);
}

$str_arr = array(
"iameverysorry",
"快乐编程，快乐生活",
"php编程",
"1997年香港回归",
"英语学习abc",
"123456789"
);

$patt_ch = chr(0xa1) . "-" . chr(0xff);

foreach ($str_arr as $str)
{
echo "字符串'$str' 是";
if (preg_match("/^[$patt_ch]+$/", $str))
{
echo "完全中文";
echo "
";
echo "
";
}
else
{
echo "非完全中文";
echo "
";
echo "
";
}
}

$str_arr = array(
"mymail@somesite.com",
"my_mail@somesite.com",
"my-mail@somesite.com",
"my.mail@site.com.cn",
"mymail@site.com.ccoomm",
"mymail@site.cn",
"mymail@@@lsite.com",
"mymail@site",
"mymail@somesite.com",
"my2007@somesite.com",
"163mail_for-me777@somesite.com",
);

$patt_email = "/^[_a-za-z0-9-]+@([0-9a-z][0-9a-z-]+.)+[a-z]{2,4}$/";

foreach ($str_arr as $str)
{
echo "字符串'$str'：是";
if (preg_match($patt_email, $str))
{
echo "合法的email格式";
echo "
";
echo "
";
}
else
{
echo "不合法的email格式";
echo "
";
echo "
";
}
}
// 17、url正则表达式。
$str_arr = array(
"http://www.111com.net",
"mb.111com.net",
"http://www.myoosite.com/abc/123.html",
"http//down.111com.net",
":www.myoosite.com"
);

$patt_url = "/^(http://)?[a-za-z0-9]+(.[a-za-z0-9]+)*.+$/";

foreach ($str_arr as $str)
{
echo "字符串'$str'：是";
if (preg_match($patt_url, $str))
{
echo "合法的url格式";
echo "
";
echo "
";
}
else
{
echo "不合法的url格式";
echo "
";
echo "
";
}
}