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I want to write a regex to match characters a-z except for e, n p. I can write:
[a-df-moq-z]
I'm just wondering if there's a way to write something like ([a-z except ^enp]) just to make the regex more easy to decipher which characters are excluded.
818
To match any character except a list of excluded characters, put the excluded charaters between [^ and ] . The caret ^ must immediately follow the [ or else it stands for just itself. The character '. ' (period) is a metacharacter (it sometimes has a special meaning).
The expression \w will match any word character. Word characters include alphanumeric characters ( - , - and - ) and underscores (_). \W matches any non-word character.
There are also two types of regular expressions: the "Basic" regular expression, and the "extended" regular expression. A few utilities like awk and egrep use the extended expression. Most use the "basic" regular expression.
+: one or more ( 1+ ), e.g., [0-9]+ matches one or more digits such as '123' , '000' . *: zero or more ( 0+ ), e.g., [0-9]* matches zero or more digits. It accepts all those in [0-9]+ plus the empty string.
You can use negative lookahead like this:
(?![enp])[a-z]
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