regex - Javascript Regular Expression not matching -

morning all

i have javascript regular expression doesn't work correctly , i'm not sure why.

i'm calling api @ https://uptimerobot.com, , getting json string details of monitor statues. wrapped in function call syntax. this:

jsonuptimerobotapi({masked-statues-obj}) 

as call being made generic script hoping test response see if had type of syntax wrapping parse accordingly.

however can't seem find regex syntax match logic:

• start of string
• an unknown number of characters [a-za-z]
• open parentheses
• open brace
• an unknown number of character
• close brace
• close parentheses
• end of string

this looks right:

^[a-za-z]+\(\{.*\}\)$ 

and works in regex101: https://regex101.com/r/se7dm6/1

however fails in code , via jsfiddle: https://jsfiddle.net/po49pww3/1/

the "m" added in regex101 actual string longer, , failed match without it, number of small tweeks i've tried havn't resulted in match in jsfiddle.

anyone know whats wrong?

escape backslashes 1 more time because within " delimiters, must escape backslash 1 more time or otherwise treated escape sequence.

var regex = new regexp("^[a-za-z]+\\(\\{.*\\}\\)$", "m"); 

demo