Introduction to php regular expression matching Chinese characters _ PHP Tutorial-php Tutorial

Describes how to match Chinese characters with regular expressions in php. Php regular expression matches Chinese characters! ^ [X {4e00}-x {9fa5}] + $ u the regular expression above is a regular expression that puzzles many php programmers to match Chinese characters, the actual php regular expression matches Chinese characters!

/^ [\ X {4e00}-\ x {9fa5}] + $/u

The above regular expression has plagued many php programmers.Regular Expression Matching Chinese characters

You may think it is very simple. In fact, different codes and different programming languages are slightly different, and you will not be able to get the correct results if you do not pay attention to them.

The following is an example of UTF-8 encoding:
$ Str="Chinese characters";
If (Preg_match("/^ [\ X {4e00}-\ x {9fa5}] + $/u",$ Str)){
Print ("This string is all Chinese");
} Else {
Print ("Not all strings are Chinese");
}


The following example containsExample:

$ Action=Trim($ _ GET['Action']);
If ($ Action="Sub")
{
$ Str=$ _ POST['Dir'];
// If (! Preg_match ("/^ [". chr (0xa1 ). "-". chr (0xff ). "A-Za-z0-9 _] + $/", $ str) // GB2312 regular expression of Chinese characters, letters, numbers, underscores (_)
If (!Preg_match("/^ [\ X {4e00}-\ x {9fa5} A-Za-z0-9 _] + $/u",$ Str))// UTF-8, Chinese characters, letters, numbers, underscores, regular expressions
{
Echo"[".$ Str."] Contains illegal characters";
}
Else
{
Echo"[".$ Str."] Completely legal, pass! ";
}
}
?>


Success! /^ [\ X {4e00}-\ x {9fa5}] + $/u the regular expression above is a regular expression that troubles many php programmers to match Chinese characters., actual...