[docs] [issue35584] Wrong statement about ^ in howto/regex.rst

[Raymond Hettinger]

Raymond Hettinger <raymond.hettinger at gmail.com> added the comment:

The caret has several meanings:

* Generally, it is a beginning of string: r'^bol'

* When MULTILINE is on, it is a beginning of line: r'^bos'

* Escaped with a backslash, it is just a caret: r'a\^b'

* Immediately after a left bracket, it inverts a character set: r'[^aeiou]'

* Elsewhere in brackets, it is just a caret: r'[ab^d]'

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nosy: +rhettinger
versions:  -Python 3.4, Python 3.5

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