regex - 忽略字符串开头的空格

Question

I have to validate a string into the jquery textcomplete. Now my strings are arragned on multiple lines, a single line may have a couple key = value or multiple separated by commas like:

key1=value1, mkey2 = value2;
  input3 =  value3

The expression I need must match the left operand of the expression

What I did:

/(?:,\s*|^\s|^|,)(?:\s*)([^=]\w*)/

My issue is that it instead of just returning

"key1" "mkey2" "input3"

it returns

["key1", "key1"], [", mkey2", "mkey2"] , ["   input3", "input3"]

But I'm expecting (actually jQuery.textcomplete is expecting)

["key1"], ["mkey2"] , ["input3"]

JSFIDDLE

EDIT: JS Code (previously was only on jfiddle)

var items = [
    "key_1", 
    "key_2", 
    "key",
    "halt",
    "keybone",
    "klingon",
    "kabum"
    ];

$('#myTextArea1').textcomplete(
[{
    match: /[^=](\w*)$/,
    index: 1, // default = 2
    search: function (term, callback) {
        term = term.toLowerCase();
        callback($.map(items, function (item) {
            return item.toLowerCase().indexOf(term) >= 0 ? item : null;
        }));
    },
    replace: function (item) {
        return '' + item + ' = ';
    }
}]);

Answer 1

I'm not sure how you're calling it, but try this out:

\s*(\w+)\s*=

Answer 2

This is the RegEx I was looking for:

/(?<=^|,\s|,)(\w+(?=[=]|$))/m

What does it do?

• (?<=^|,\s|,) is a lookbehind that checks if the string is the beginning ^ , is , or ,

• (\w+(?=[=]|$)) could be decomposed in two sub-expressions:

<> \w+ that matches a word of at least a letter or digit POSIX [:alnum:] is not supported in JS

<> (?=[=]|$) is a lookahead that keeps the expression only if we're at the end of text $ or the next character is not a =