javascript - RegEx : Match a string enclosed in single quotes but don't match those inside double quotes -

i wanted write regex match strings enclosed in single quotes should not match string single quote enclosed in double quote.

example 1:

a = 'this single-quoted string'; 

the whole value of a should match because enclosed single quotes.

edit: exact match should be: 'this single-quoted string'

example 2:

x = "this 'string' single quote"; 

x should not return match because single quotes found inside double quotes.

i have tried /'.*'/g matches single quoted string inside double quoted string.

thanks help!

edit:

to make clearer

given below strings:

the "quick 'brown' fox" jumps on 'the lazy dog' near "the 'riverbank'". 

the match should be:

'the lazy dog' 

assuming won't have deal escaped quotes (which possible make regex complicated), , quotes correctly balanced (nothing it's... "monty python's flying circus"!), single-quoted strings followed number of double quotes:

/'[^'"]*'(?=(?:[^"]*"[^"]*")*[^"]*$)/g 

see live on regex101.com.

explanation:

'        # match ' [^'"]*   # match number of characters except ' or " '        # match ' (?=      # assert following regex match here:  (?:     # start of non-capturing group:   [^"]*" # number of non-double quotes, quote.   [^"]*" # same thing again, ensuring number of quotes.  )*      # match group number of times, including zero.  [^"]*   # match number of characters except "  $       # until end of string. )        # (end of lookahead assertion)