My go to resource for this issue is: * http://www.regular-expressions.info/tools.html http://www.regular-expressions.info/tools.html nooks and crannies of pre

My go to resource for this issue is: * http://www.regular-expressions.info/tools.html http://www.regular-expressions.info/tools.html nooks and crannies of pretty much every major flavor and variant, prepared as an easy reference.