英文:
I want to validate my numbers with regex before using it but it not working out
问题
I want to validate my numbers with regex before using it but it not working out
I want the first digit to start with 0 follow by 2 or 5 and follow by 4 and the rest continue to 10 digit
<?php$str = "0241310102";$pattern = "([0]{1}[2,5]{1}[4]{1}[0-9]{7})";if(preg_match($pattern, $str)){echo "YES";}else{echo "NO";}?>
英文:
I want to validate my numbers with regex before using it but it not working out
I want the first digit to start with 0 follow by 2 or 5 and follow by 4 and the rest continue to 10 digit
<?php$str = "0241310102";$pattern = "([0]{1}[2,5]{1}[4]{1}[0-9]{7})";if(preg_match($pattern, $str)){echo "YES";}else{echo "NO";}?>
答案1
得分: 1
- 你需要将模式锚定到字符串的开头/结尾（
^，$）。 - 单个数字不需要被指定为字符类
[0]→0 - 量词只需要在与1不同的情况下指定
0{1}→0 [2,5]会包含字符类中的逗号 →[25]
$examples = ["0241310102","1241310102","0541310102","0551310102","0241"];$pattern = '(^0[25]4[0-9]{7}$)';foreach ($examples as $example) {echo $example, ": ";if (preg_match($pattern, $example)) {echo "YES", "\n";} else {echo "NO", "\n";}}
英文:
- You need to anchor the pattern to the start/end of the string (
^,$). - Single digits do not need to be specified as a character class
[0]→0 - Quantifier need only to be specified if different from one
0{1}→0 [2,5]would include the comma in the character class →[25]
$examples = ["0241310102","1241310102","0541310102","0551310102","0241"];$pattern = '(^0[25]4[0-9]{7}$)';foreach ($examples as $example) {echo $example, ": ";if (preg_match($pattern, $example)) {echo "YES", "\n";} else {echo "NO", "\n";}}
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