Regex not validating end of string

Question

Consider the following scenario (Javascript code):

regex = new RegExp((/([\d,.]+)[ $]/));
value = "2.879"

The regexp doesn't match value, but it matches (value+" ") therefore i think that the $ is not matched? Why is that?

Shouldn't the $ validate the end of string?

score 6 · Accepted Answer · answered Apr 22 '15 at 23:38

6

Special characters like $ don't have the same meaning inside a character class. In a character class they're just characters, so [ $] will match either the space character or the $ character. It won't match the end of a string.

If you want to match either a space character or the end of the string, you should use alternation, i.e. ( |$).

answered Apr 22 '15 at 23:38

Jordan Running

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Thanks.Great Answer ! Do you know if i can avoid capturing grouping though? – user3452075 Apr 23 '15 at 01:32
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Use `?:` to start a non-capturing group (i.e. `(?:pattern)`) – James Wilkins Apr 23 '15 at 01:41
James has got it: `(?: |$)` – Jordan Running Apr 23 '15 at 01:42
Thanks! Sorry for bothering you so much. (If you want please let me know if there is a system to select this as the answer to the question) – user3452075 Apr 23 '15 at 02:37

Regex not validating end of string

1 Answers1