I'm trying to select commas without numbers of 4 digits or the word "id" before, I tried with this:
( ? < ! [ \ d { 5 } | id ] ) ,
The problem
for example, if input string is "1999," that comma is not selected, I don't understand why.
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1It's not clear what you want to achieve.Diego– Diego2013-01-11 14:53:37 +00:00Commented Jan 11, 2013 at 14:53
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1Please provide examples of what do you want.anubhava– anubhava2013-01-11 14:55:01 +00:00Commented Jan 11, 2013 at 14:55
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2 Answers
Try this pattern:
(?<!\d{5}|id),
Your pattern, (?<![\d{5}|id]), is looking for a comma that is not after a digit, {, }, |, i, or d - They should not be in a charterer class: []. If anything, (?<![\d]{5}|id), will also work, but is redundant.
Comments
First of all, unless you're using the /x flag, each space will attempt to match a space. So take those out.
Second, you're using [...] presumably to group an alternation (|) but square brackets actually indicate a character class, i.e. [\d{5}|id] is equivalent to [id5{}|] and matches any one of those characters, but not more. What you mean is this:
(?<!\d{5}|id),
The final problem might be that many implementations of regex (you haven't specified which you're using) don't support variable-width lookbehind assertions. So, you may need to do something like:
(?<!\d{5}|...id),
