CODEWITHSUNDEEP
phpregex
Alex Pliutau
Alex Pliutau

Reputation: 21947

php regular expression for "|" and digits


I want know, what regular expression should I have for my string. My string can contains only "|" and digits.
For example: "111|333|111|333". And string must begin from number. I am using this code, but he is ugly:

if (!preg_match('/\|d/', $ids)) {
    $this->_redirect(ROOT_PATH . '/commission/payment/active');
}

Thank you in advance. Sorry for my english.

Upvotes: 2

Views: 196

Answers (4)

Alin P.
Alin P.

Reputation: 44346

The regex is:

^\d[|\d]*$

^   - Start matching only from the beginning of the string
\d  - Match a digit
[]  - Define a class of possible matches. Match any of the following cases:
    |   - (inside a character class) Match the '|' character
    \d  - Match a digit
$   - End matching only from the beginning of the string

Note: Escaping the | is not necessary in this situation.

Upvotes: 2

codaddict
codaddict

Reputation: 455312

Looking at your example I assume you are looking for a regex to match string that begin and end with numbers and numbers are separated with |. If so you can use:

^\d+(?:\|\d+)*$

Explanation:

^      - Start anchor.
 \d+   - One ore more digits, that is a number.
 (?  ) - Used for grouping.
 \|    - | is a regex meta char used for alternation, 
         to match a literal pipe, escape it.
  *    - Quantifier for zero or more.
$      - End anchor.

Upvotes: 3

Spiny Norman
Spiny Norman

Reputation: 8347

I think /^\d[\d\|]*$/ would work, however, if you always have three digits separated by bars, you need /^\d{3}(?:\|\d{3})*$/.

EDIT: Finally, if you always have sequences of one or more number separated by bars, this will do: /^\d+(?:\|\d+)*$/.

Upvotes: 1

Konrad Rudolph
Konrad Rudolph

Reputation: 545913

A string that contains only | or digits and begins with a digit is written as ^\d(\||\d)*$. That means: either \| (notice the escape!) or a digit, written as \d, multiple times.

The ^ and $ mean: from start to end, i.e. there’s no other character before or after that.

Upvotes: 1

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