regex - Javascript Regular Expression not matching

Question

Morning All

I have a javascript regular expression that doesn't work correctly and I'm not sure why.

I'm calling the API at https://uptimerobot.com, and getting back a JSON string with details of the monitor statues. This is however wrapped in a function call syntax. Like this:

jsonUptimeRobotApi({MASKED-STATUES-OBJ})

As this call is being made from a generic script I was hoping to test the response to see if it had this type of syntax wrapping then parse it accordingly.

However I can't seem to find a RegEx syntax to match the logic:

• Start of string
• An unknown number of characters [a-zA-Z]
• Open parentheses
• Open brace
• An unknown number of any 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 it fails in my code and via jsFiddle: https://jsfiddle.net/po49pww3/1/

The "m" was added in regex101 as the actual string is much longer, and failed to match without it, however a number of small tweeks that I've tried havn't resulted in a match in jsFiddle.

Anyone know whats wrong?

Answer 1

Escape all the backslashes one more time because within " delimiters, you must escape the backslash one more time or otherwise it would be treated as an escape sequence.

var regEx = new RegExp("^[a-zA-Z]+\(\{.*\}\)$", "m");

DEMO