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Asked: 2026-05-17T16:43:31+00:00

I have a string: users/554983490\/Another+Test+/Question????\/+dhjkfsdf/ How would i write a RegExp that would match

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I have a string:


users/554983490\/Another+Test+/Question????\/+dhjkfsdf/

How would i write a RegExp that would match all of the forward slashes NOT preceded by a back slash?

EDIT: Is there a way to do it without using a negative lookbehinds?

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1 Answer

  1. Editorial Team

    If your regular expressions support negative lookbehinds:

    /(?<!\\)\//

    Otherwise, you will need to match the character before the / as well:

    /(^|[^\\])\//

    This matches either the start of a string (^), or (|) anything other than a \ ([^\\]) as capture group #1 (). Then it matches the literal / after. Whatever character was before the / will be stored in the capture group $1 so you can put it back in if you are doing a replace….

    Example (JavaScript):

    'st/ri\\/ng'.replace(/(^|[^\\])\//, "$1\\/");
// returns "st\/ri\/ng"
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