regex - Replace nested expressions using Ruby -


how replace x between bracket in expression below:

{ x} x {x } x x {} x{x}{  x}

without preserving spaces inside braces

you can use .gsub both look-behind , look-ahead operator:

# replace instances of x within curly braces y '{ x} x {x } x x {} x{x}{  x}'.gsub(/(?<={)\s*x\s*(?=})/, 'y')

output:

"{y} x {y} x x {} x{y}{y}"

preserving spaces inside braces

you need alternate approach preserving spaces:

'{ x} x {x } x x {} x{x}{  x}'.gsub(/{(\s*)x(\s*)}/, '{\1y\2}')

output:

"{ y} x {y } x x {} x{y}{  y}"

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