什么时候preg_match():未知的修饰符错误发生?

问题描述

\\    $DigitalSignature have full name value passed
$SignatureMatch =  '/' . strtolower( $NameFirst . ' ' . $NameLast ) . '$/';
if( true == preg_match( $SignatureMatch, strtolower( $DigitalSignature ) ) )
{
    $boolIsValid = true;
}

我要使用此代码来使名字和姓氏与数字签名完全匹配.但这会在生产(实时)的错误日志中向我报告错误.

I am having this code for exact matching first name and last name match with digital signature. But this gives error reported me in error log on production(live).

preg_match(): Unknown modifier 'b'

我无法重现此错误.我首先如何得到这个错误.以及如何解决此错误以进行精确匹配.

I am unable to reproduce this error. How can I get this error firstly. And how to resolve this error for exact matching.

我已经看到许多关于SO的问题，但没有得到何时会出现此错误.以及我该如何解决.我见过的许多问题是-

I have seen many questions on SO but not getting when will get this error. And how do I resolve that. Some of questions out of many I have saw are -

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13. 使用preg_match(时，未知修饰符'(' )和REGEX表达式

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3. Warning: preg_match() [function.preg-match]: Unknown modifier
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5. Unknown modifier 'g' PHP regex error
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7. preg_match() Unknown modifier '[' help
8. Warning: preg_match() [function.preg-match]: Unknown modifier 'v'
9. PHP Preg_match match exact word
10. Unknown modifier 'v' when using preg_match() expression in regex
11. preg_match(); - Unknown modifier '+'
12. preg_match error Unknown modifier '{'
13. Unknown modifier '(' when using preg_match() with a REGEX expression

推荐答案

如果名字或姓氏包含/，则您的正则表达式将类似于:

If the first name or last name contains a /, your regex will look something like:

/john/doe$/

对于preg_match，看起来正则表达式是/john/，后跟的doe$/是修饰符.这些当然是无效的修饰符.您需要使用 preg_quote 来对正则表达式自身中的正则表达式定界符(/)进行转义.

To preg_match, this looks like the regex is /john/, with the trailing doe$/ being the modifiers. Those are of course invalid modifiers. You need to escape the regex delimiters (/) inside the regex itself using preg_quote.

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