PHP ??? ??? ??
Atom
Atom? ????? ?? ?? ?????. ????? ??? Atom? ???? ?? ?????. ??? ?? ????? ?? ??? ??? ????? ???.
??? ??? ??? ?? ??? ?? ?????.
??: ??, ??? ??, ? ??, 0-9, A-Za-z, ???, ???? ? ? ????. ??, ?? ??? ?? ?????.
??? ??? ???? ?? ?? preg_match ??? ???????.
int preg_match ( string $regular, string $string[, array &$result] )
??: $regular ??? ???? $string ??? ??????. ???? ?? ?? ?? ?? ???? ??? ??? $result ??? ????. ??? ??? 0? ?????.
??: ?? preg_match?? ????? ???? ?? ???????. ??? ?? ?? ????? ???? ?????. ?? ? ????? ?? ??? ?????.
??? ?? ?????:
<?php
//定義一個變量叫zz，放正則表達示。為了方便大家記憶，如果你英文比較ok，建議把變量名還是寫成英文的$pattern。
$zz = '/a/';
$string = 'ddfdjjvi2jfvkwkfi24';
if(preg_match($zz, $string, $matches)){
echo '匹配到了，結(jié)果為：';
var_dump($matches);
}else{
echo '沒有匹配到';
}
?>a? ???? ??? $string? a? ???? ?? ???? ????.
<?php
$zz = '/wq/';
$string = 'ssssswqaaaaaa';
if(preg_match($zz, $string, $matches)){
echo '匹配到了，結(jié)果為：';
var_dump($matches);
}else{
echo '沒有匹配到';
}
?>? ????? s ?? wq? ???? ??? ??? ????.
???? ?? ??? ??? ?????.
<?php
$zz = '/ /';
$string = 'sssssw aaaaa';
if(preg_match($zz, $string, $matches)){
echo '匹配到了，結(jié)果為：';
var_dump($matches);
}else{
echo '沒有匹配到';
}
?>?? ??? ??? ????.
? ??? $ string is ??? w ?? ?? ??? ????. ??? ??? ???? ??? ??? ??? 1? ?????. ?? ??? ????? ??? ??? ? ?? ? ? ????.
??? ??? ??
| 原子 | 說明 |
|---|---|
| d | 匹配一個0-9 |
| D | 除了0-9以外的所有字符 |
| w | a-zA-Z0-9_ |
| W | 除了0-9A-Za-z_以外的所有字符 |
| s | 匹配所有空白字符n t r 空格 |
| S | 匹配所有非空白字符 |
| [ ] | 指定范圍的原子 |
? ?? ?????? ???. ???? ??? ???? ?? ?? ????. ??? ? ??? ?????. d? 0-9? ???? D? 0-9? ??? ?? ?????.
? ??? ?? ???? ???? ????. ???? ???? ?? ??? ??? ?????.
???? ? ? ? ??? ?? ???? ??? ????? ????. ???? ??? ??? ?? ??? ?? ??? ?????.
d? 0-9 ?? ??
<?php
$zz = '/\d/';
$string = '我愛喝9你愛不愛喝';
if(preg_match($zz, $string, $matches)){
echo '匹配到了，結(jié)果為：';
var_dump($matches);
}else{
echo '沒有匹配到';
}
?>D? 0-9 ??? ?? ??
<?php
$zz = '/\D/';
$string = '121243中23453453';
if(preg_match($zz, $string, $matches)){
echo '匹配到了，結(jié)果為：';
var_dump($matches);
}else{
echo '沒有匹配到';
}
?>????? ??? ????? ?????. 0~9 ??? ??? ??? ?????.
w? a-zA-Z0-9_
<?php
$zz = '/\w/';
$string = '新中_國萬歲呀萬歲';
if(preg_match($zz, $string, $matches)){
echo '匹配到了，結(jié)果為：';
var_dump($matches);
}else{
echo '沒有匹配到';
}
?>? ?????. ??? ???? ??? ?????.
W? a-zA-Z0-9_
<?php
$zz = '/\w/';
$string = 'afasABCWEQR44231284737';
if(preg_match($zz, $string, $matches)){
echo '匹配到了，結(jié)果為：';
var_dump($matches);
}else{
echo '沒有匹配到';
}
?>? ???? ????. ???? ?? ??? ?? a-zA-Z0-9_??, a-zA-Z0-9_? ?? ?? ?? ?????.
s? ?? ?? ?? n t r ??? ?????.
<?php
$zz = '/\s/';
$string = "中國萬
歲";
if(preg_match($zz, $string, $matches)){
echo '匹配到了，結(jié)果為：';
var_dump($matches);
}else{
echo '沒有匹配到';
}
?>? ??? ??? ???? ????? ?????.
S?? ?? ?? ?? ??
<?php
$zz = '/\s/';
$string = "
a ";
if(preg_match($zz, $string, $matches)){
echo '匹配到了，結(jié)果為：';
var_dump($matches);
}else{
echo '沒有匹配到';
}
?>? ????? ?????. ??? ???? ??? ?? ? ????? ?????. ??? ??? ?? ?? a? ????. ??? ??? ?????.
[] ??? ??? ??
<?php
$zz = '/[0-5]\w+/';
$string = '6a';
$string1 = '1C';
if(preg_match($zz, $string, $matches)){
echo '匹配到了，結(jié)果為：';
var_dump($matches);
}else{
echo '沒有匹配到';
}
?>??:
?? ??? 0-5? $string? ???? ?????. , $string1 ??. ???? $string? ? ?? ?? 6?? ?? [0-5] ??? ??? ????.
<?php
$zz = '/[a-zA-Z0-9_]\w/';
$string = 'ab';
$string1 = '9A';
if(preg_match($zz, $string, $matches)){
echo '匹配到了，結(jié)果為：';
var_dump($matches);
}else{
echo '沒有匹配到';
}
?>??:
$string? $string1? ?? ????? ?????. w? [a-zA-Z0-9_]
<?php
$zz = '/[abc]\d+/';
$string = 'a9';
$string1 = 'b1';
$string2 = 'c5';
$string3 = 'd4';
if(preg_match($zz, $string, $matches)){
echo '匹配到了，結(jié)果為：';
var_dump($matches);
}else{
echo '沒有匹配到';
}
?>??:
$string, $string1, $string2? ????? ????? $string3? ??????. $string3? [abc]? ??? ????? d?? ?????.
[^ ??]? ??? ??? ??? ???? ????.
<?php
$zz = '/[^0-9A-Za-z_]/';
$string = 'aaaaab311dd';
$string1 = '!$@!#%$#^##';
if(preg_match($zz, $string, $matches)){
echo '匹配到了，結(jié)果為：';
var_dump($matches);
}else{
echo '沒有匹配到';
}
?>??:
1. $string ?? failed ??? $string1? ???? ?????. ??? ?? ?? ??? ?? ?????.
2.^ ??? ?? ?? ??? ??? ??? ?? ??? ???? ?? ????.
??:
| 原子 | 等價式 |
|---|---|
| w | [a-zA-Z0-9_] |
| W | [^a-zA-Z0-9_] |
| d | [0-9] |
| D | [^0-9] |
| s | [ tnfr] |
| S | [^ tnfr] |
