Javascript replace method with both array and regex

Question

How i can replace any character except 0-9 a-z and and array of some characters with '' (nothing).

My code is look like this

Var pCharArray = ['l', 'o', 'c'];//local characters
Var stringOrginal = 'Some Text';
stringOrginal.replace(/(^[0-9][a-z]pCharArray)/g, '');

Every character that is not 0-9 AND not a-z AND not in pCharArray, should be removed.

Note that the array is useless here as all it's elements are inside a-z. This demo change the example a bit to show it works. — gdoron
– gdoron, Commented Jun 24, 2012 at 18:41
Is the pCharArray every going to have non a-z characters? ...like @gdoron said... — user1106925
– user1106925, Commented Jun 24, 2012 at 18:41

gdoron · Accepted Answer · 2012-06-24 18:39:15Z

4

You can use this:

stringOrginal.replace(new RegExp("[^0-9a-z" + pCharArray.join('')+"]", 'g'), "");

Note:

Var => var (lowercase)

Live DEMO

edited Jun 24, 2012 at 18:39

answered Jun 24, 2012 at 18:33

gdoron

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3 Comments

bjornd Over a year ago

This will do the opposite: 0-9 and a-z and any character in pCharArray will be removed.

raina77ow Over a year ago

Why downvote answers with typos instead of just commenting the issue? Will never know, I suppose. Upvoted.

Hamidreza Over a year ago

Thanks you, your answer is true, but in first edit that i tested your code and @bjornd code ,bjornd code works for me.

bjornd · Accepted Answer · 2012-06-24 18:48:55Z

3

^ character means negation only when used inside of character class, i.e. [^a] means any character except a. When it's used outside of the character class it means the beginning of the string.

Correct code:

stringOrginal.replace(new RegExp("[^0-9a-z"+pCharArray.join('')+"]", 'g'), '');

Also please note if you want to include backslash or closing bracket to the pCharArray array you should state them as '\\' and '\]' there respectively.

edited Jun 24, 2012 at 18:48

answered Jun 24, 2012 at 18:34

bjornd

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5 Comments

Fabrício Matté Over a year ago

Nice, but if OP adds some metachars inside the array (such as -) it may require escaping depending on its position. +1

bjornd Over a year ago

@FabrícioMatté Actually only \ and ] should be escaped, all other characters will be treated as control once only at first position.

gdoron Over a year ago

@bjornd. What about \ / [ ] - chars?

bjornd Over a year ago

@gdoron As I noted only \ and ] are problematic and should be escaped.

Fabrício Matté Over a year ago

I always have trouble understanding what really requires escaping inside character classes, but still, how come - doesn't need escaping (of course, if it's at beginning or end of the character class it won't require escaping), but if I have "[0"+"-"+"9]", wouldn't it create a [0-9] interval?

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