Regular expression to limit number of characters to 10

You can use curly braces to control the number of occurrences. For example, this means 0 to 10:

/^[a-z]{0,10}$/

The options are:

{3} Exactly 3 occurrences;

{6,} At least 6 occurrences;

{,4} At most 4 occurrences;

{2,5} 2 to 5 occurrences.

See the regular expression reference.

Your expression had a + after the closing curly brace, hence the error.

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/^[a-z]{0,10}$/ should work. /^[a-z]{1,10}$/ if you want to match at least one character, like /^[a-z]+$/ does.

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It might be beneficial to add greedy matching to the end of the string, so you can accept strings > than 10 and the regex will only return up to the first 10 chars. /^[a-z0-9]{0,10}$?/

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grep '^[0-9]\{1,16\}' | wc -l

Gives the counts with exact match count with limit

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It very much depend on the program you're using. Different programs (Emacs, vi, sed, and Perl) use slightly different regular expressions. In this case, I'd say that in the first pattern, the last "+" should be removed.

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pattern: /[\w\W]{1,10}/g

I used this expression for my case, it includes all the characters available in the text.

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