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| -rw-r--r-- | Doc/howto/regex.rst | 3 |
1 files changed, 3 insertions, 0 deletions
diff --git a/Doc/howto/regex.rst b/Doc/howto/regex.rst index c19c483..15372e7 100644 --- a/Doc/howto/regex.rst +++ b/Doc/howto/regex.rst @@ -245,6 +245,9 @@ You can omit either *m* or *n*; in that case, a reasonable value is assumed for the missing value. Omitting *m* is interpreted as a lower limit of 0, while omitting *n* results in an upper bound of infinity. +The simplest case ``{m}`` matches the preceding item exactly **m** times. +For example, ``a/{2}b`` will only match ``'a//b'``. + Readers of a reductionist bent may notice that the three other quantifiers can all be expressed using this notation. ``{0,}`` is the same as ``*``, ``{1,}`` is equivalent to ``+``, and ``{0,1}`` is the same as ``?``. It's better to use |