Three ways in order of increasing difficulty

• Use regex objects: print qr/(?:this)(?!didn't)match/
• Use the debug mode of the 're' module. use re 'debug';/(?:this)(?!didn't)match/
• Use Dominus' Rx module.

I list the Rx module last because when I last looked at it I it required patching first. Its also probably the one you want to use if you are serious about this.

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