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regexsplit
Alex Schenkel
Alex Schenkel

Reputation: 832

regular expression to match pipe separated strings with pipe escaping

I'd like to get the single strings of a pipe-separated string, with "pipe escaping" support, e.g.:

fielda|field b |field\|with\|pipe\|inside

would get me:

array("fielda", "field b ", "field|with|pipe|inside")

How would I reach that goal with a regular expression?

Upvotes: 3

Views: 11468

Answers (4)

Wiktor Stribiżew
Wiktor Stribiżew

Reputation: 626748

You may match these items with

(?:[^\\|]|\\[\s\S])+

See the regex demo.

NOTE: If you need to split on a character other than | just replace it within the first negated character class, [^\\|]. Just note that you will have to escape ] (unless it is placed right after [^) and - (if not at the start/end of the class).

The [\s\S] can be replaced with a . in many engines and pass the appropriate option to make it match across line endings.

See the regex graph:

enter image description here

JS demo:

console.log(
   "fielda|field b |field\\|with\\|pipe\\|inside".match(/(?:[^\\|]|\\[\s\S])+/g)
)
// =>  ["fielda", "field b ", "field\|with\|pipe\|inside"]

Upvotes: 0

Casimir et Hippolyte
Casimir et Hippolyte

Reputation: 89547

An other way with php, using strtr that replace \| with a placeholder:

$str = 'field a|field b|field\|with\|pipe\|inside';
$str = strtr($str, array('\|' => '#'));
$result = array_map(function ($i) {
    return strtr($i, '#', '|');
}, explode('|', $str));

Upvotes: 0

Enissay
Enissay

Reputation: 4953

This should work too:

((?:[^\\|]+|\\\|?)+)

The regex will capture everything up to a single | (including \|)

DEMO

Upvotes: 1

vks
vks

Reputation: 67968

Split  by this (?<!\\)\|

See demo.The lookbehind makes sure | is not after \.

https://regex101.com/r/pM9yO9/15

Upvotes: 7

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