Shulou(Shulou.com)06/03 Report--

Regular expression:

The number of times matching characters appear

Use * to match all the matching results once, but if you only need to set the number of times, you should use\ {}. There are three forms of this pattern.

Pattern\ {n\} matching pattern occurs n times

Pattern\ {n,\} matching patterns occur at least n times

Pattern\ {NMagne m\} matching pattern occurs n to m times, and nMagne m is an arbitrary integer between 0 and 255respectively.

Example:

A\ {2\} B matching value is AAB

A\ {4\} B matching value is AAAAB or AAAAAAB, but cannot be AAAB

A\ {3pm 5\} matching value is AAAB,AAAAB,AAAAAB

Note: it is not difficult for regular expressions to use a single metacharacter, especially if multiple metacharacter sets are mixed.

Grep'^ H. [Amurz Zjinaqizi] s\ {2pr 4\} c$'./test

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