I am using this RegEx statement…
/\((\$.*?)\)/g
…to locate all parenthetical dollar amounts found in a string like this…
"My 3 meals were fairly cheap ($45) but I ended up spending a lot more ($1532.01) than I anticipated."
What RegEx statement would amend the source sentence so that all of the parenthetical amounts were properly formatted to include two decimal places and commas where needed?
"My 3 meals were fairly cheap ($45.00) but I ended up spending a lot more ($1,532.01) than I anticipated."
To clarify, the objective is not to extract the values with the proper formatting (e.g., in an array); it's to change the sentence so that it shows the proper formatting.
You can use
const str = 'My 3 meals were fairly cheap ($45) but I ended up spending a lot more ($1532.01) than I anticipated';
const regex = /\$(\d+(?:\.\d+)?)/g;
console.log( str.replace(regex, (m,g) => '$' + Number(g).toLocaleString('en-US', { minimumFractionDigits: 2 })) )See the regex demo.
Output:
My 3 meals were fairly cheap ($45.00) but I ended up spending a lot more ($1,532.01) than I anticipated
The \$(\d+(?:\.\d+)?) regex matches a $ and then captures into Group 1 any one or more digits followed with an optional sequence of a . and one or more digits.
In the replacement, a callback arrow function is used to append the modified number to the $ char to form the replacement string.