如何選擇沒有特殊字符或數字的字符串

Question

我有成千上萬個字符串，我只想選擇其中沒有任何特殊字符的字符串。 特殊字符包括;:~?[]()+-_*^%$#@><{}\\|/和數字0-9。 因此，基本上有效的句子是包含字母或帶逗號的字母的句子。

什么是最快的方法，以便可以快速有效地完成任務。

例：

1. She has the air of blank disdainful amusement a cat gets when toying with a mouse 
2. Origin Expand 1535-1545 1535-45; disdain + -ful Related forms Expand disdainfully, adverb disdainfulness, noun Synonyms Expand contemptuous, haughty, contumelious

3. British Dictionary definitions for disdainful Expand disdainful /dsdenfl/ adjective

4.An example of someone who is disdainful, is a person saying they dislike someone just because of their religion

應該選擇句子1和4

所以我需要一些東西

if( $s does not have number an does not have special character)
{
//Save it
}

任何幫助將不勝感激Ahmar

Answer 1

if (! preg_match('/[\'0-9^£$%&*()}{@#~?><>|=_+¬-]/', $string))
{
    // No special characters or numbers found in this string.
}

Answer 2

構建自己的正則表達式以僅傳遞字母，空格和逗號。

^[a-zA-Z\s,]+$

要么

^[a-zA-Z\h,]+$

要么

^[\p{L}\h,]+$

DEMO

\\h匹配水平空格。 因此^[a-zA-Z\\h,]+$匹配具有一個或多個空格或字母或逗號的行。 \\p{L}可以匹配任何語言的任何字母。

if ( preg_match('~^[a-zA-Z\h,]+$~m', $string))
{
    // do here
}

Answer 3

^[^;:~?\[\]()+_*^%$#@><{}\|\/0-9-]+$

您也可以嘗試此操作。請參閱演示。

http://regex101.com/r/oE6jJ1/32

$re = "/^[^;:~?\\[\\]()+_*^%$#@><{}\\|\\/0-9-]+$/im";
$str = "She has the air of blank disdainful amusement a cat gets when toying with a mouse \n\nOrigin Expand 1535-1545 1535-45; disdain + -ful Related forms Expand disdainfully, adverb disdainfulness, noun Synonyms Expand contemptuous, haughty, contumelious\n\nBritish Dictionary definitions for disdainful Expand disdainful /dsdenfl/ adjective\n\nAn example of someone who is disdainful, is a person saying they dislike someone just because of their religion";

preg_match_all($re, $str, $matches);

Answer 4

最有效的方法是檢測字符串是否包含至少一個不需要的字符：

使用范圍： 假設您僅處理ascii字符

if ( !preg_match('/[!-+--@[-`{-~]/', $str )) {
 // the string is allowed
}

或更廣泛地使用： 帶有POSIX字符類

if ( !preg_match('/[^[:alpha:],[:space:]]/', $str )) {
 // the string is allowed
}

Answer 5

//your string variable:    

$string = "She has the air of blank disdainful amusement a cat gets when toying with a mouse 
Origin Expand 1535-1545 1535-45; disdain + -ful Related forms Expand disdainfully, adverb disdainfulness, noun Synonyms Expand contemptuous, haughty, contumelious

British Dictionary definitions for disdainful Expand disdainful /dsdenfl/ adjective

An example of someone who is disdainful, is a person saying they dislike someone just because of their religion";

//match function, and echo output    

preg_match_all('/^[a-z, ]+$/gmi', $string, $matches);

foreach($matches[0] as $found){
    echo $found . "\n"; //echoes sentences 1 and 4
}