use the /x modifier on the regex, which lets you throw in whitespace for formatting without screwing up semantics
... with one significant caveat: spaces lose their semantics.
The RE /foo bar/ is not the same as /foo bar/x. The latter is equivalent to /foobar/. And there is a space in the OP's RE, which will therefore be incorrect if /x is blindly applied.
The choices are either to escape the space with a backslash (which is difficult to read, especially if the backslash-space winds up at the end of a line) or replace it with \s, which is not semantically equivalent (it can match tabs or newlines as well). There is always [\ ] but I'm not sure it's a win.
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