PHP和正则表达式：检查字符串是否遵循带方括号的模式

问题描述：

I have no experience with regular expressions whatsoever, hence my question.

I have a string which should look like this:

[1,24,2,59]

As the string can be manipulated by the user and hence changed, I want to check whether it is still following the same organization pattern, and only containing numbers,square brackets and commas.

我没有任何正则表达式的经验，因此我的问题。 p>

我有一个字符串应该如下所示： p>

[1,24,2,59] p>

因为字符串可以被用户操纵因此改变了，我想检查它是否仍然遵循相同的组织模式，并且只包含数字，方括号和逗号。 p> div>

答

You can use this regex in preg_match to validate your input:

'/\[\d+(,\d+)*\]/'

\[ matches the character [ literally
\d+ match a digit [0-9]
Quantifier: Between one and unlimited times, as many times as possible, giving back as
  needed [greedy]
1st Capturing group (,\d+)*
Quantifier: Between zero and unlimited times, as many times as possible, giving back as 
  needed [greedy]
Note: A repeated capturing group will only capture the last iteration. Put a capturing 
  group around the repeated group to capture all iterations or use a non-capturing group 
   instead if you're not interested in the data
, matches the character , literally
\d+ match a digit [0-9]
Quantifier: Between one and unlimited times, as many times as possible, giving back as 
  needed [greedy]
\] matches the character ] literally

答

'/^\[\d+(,\d+)*\]$/'

Same as the other answer, except it requires the whole string to match, otherwise a valid substring would suffice (e.g. "bla bla [1,3] bla bla")

'/^\[([1-9]\d+|\d)(,([1-9]\d+|\d))*\]$/'

Same, but numbers must have leading zeros removed, so "[12]" is OK but "[012]" is not.

'/^\s*\[\s*([1-9]\d+|\d)(\s*,\s*([1-9]\d+|\d))*\s*\]\s*$/'

Allows white spaces, e.g. " [ 1 , 12 , 12 ] " will be accepted but not "[1 2]".

PHP和正则表达式：检查字符串是否遵循带方括号的模式

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