Different behavior with the same regex

Asked Oct 25 '17 at 10:39

Active Oct 25 '17 at 10:39

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I have a regex wich is supposed to check for allowed characters in HTTP headers. I use it for testing string that will be slugified.

My problem is, when I use the literal version I obtain a different result from the Object version of the Regex :

Here is a JSFiddle to demonstrate the issue : https://jsfiddle.net/JosselinTD/tkxhk6fn/

var regexObject = new RegExp("^[A-z\u00C0-\u00ff\u0180-\u024f0-9\s'\.,-\/#!$%\^&\*\-_~\|`+]+$", "gi");
var regexLiteral = /^[A-z\u00C0-\u00ff\u0180-\u024f0-9\s'\.,-\/#!$%\^&\*\-_~\|`+]+$/gi;

var stringTest = 'HackForGood 2016 - León'; // More strings in the fiddle

alert('Test with object : ' + regexObject.test(stringTest) + '\nTest with literal : ' + regexLiteral.test(stringTest));

Is there a reason for the difference in behavior ?

asked Oct 25 '17 at 10:39

JosselinTD

1

`\s` and `\-` in the first regex get stripped from the escapes and match `s` and `\*\-_` turns into a range, `*-_` – Wiktor Stribiżew Oct 25 '17 at 10:42
Damn... Not only those two, every `\` in the string ends in nothing, so my regex fail. Thanks ! – JosselinTD Oct 25 '17 at 12:08
Those two are important, others may be removed from both patterns. – Wiktor Stribiżew Oct 25 '17 at 12:08

Different behavior with the same regex

0 Answers0