正则表达式匹配一个确切的字符串
问题描述:
使用PHP,什么是正则表达式匹配一个确切的字符串。正则表达式匹配一个确切的字符串
说我们有文字:
Hello, world.
How are you today?
Today is sunshine and snow wouldn't you know.
我将如何使用正则表达式来匹配字符串?:
sunshine and snow
答
使用的preg_match:
<?php
// The "i" after the pattern delimiter indicates a case-insensitive search
if (preg_match("/php/i", "PHP is the web scripting language of choice.")) {
echo "A match was found.";
} else {
echo "A match was not found.";
}
?>
使用strpos:
<?php
$mystring = 'abc';
$findme = 'a';
$pos = strpos($mystring, $findme);
// Note our use of ===. Simply == would not work as expected
// because the position of 'a' was the 0th (first) character.
if ($pos === false) {
echo "The string '$findme' was not found in the string '$mystring'";
} else {
echo "The string '$findme' was found in the string '$mystring'";
echo " and exists at position $pos";
}
?>
不要对正确的字符串使用正则表达式,而是使用“strpos”。 – gpojd 2013-02-11 18:50:23
如果你有确切的字符串,你可以使用strstr或stristr(不区分大小写) – nhahtdh 2013-02-11 18:50:26
如果没有元字符,你也可以在正则表达式中注意一个字符串。 – mario 2013-02-11 18:52:29