Replace all characters not in range (Java String)

Question

How do you replace all of the characters in a string that do not fit a criteria. I\'m having trouble specifically with the NOT operator.

Specifically, I\'m trying

Answer 1

Here's a quick cheat sheet of character class definition and how it interacts with some regex meta characters.

• [aeiou] - matches exactly one lowercase vowel
• [^aeiou] - matches a character that ISN'T a lowercase vowel (negated character class)
• ^[aeiou] - matches a lowercase vowel anchored at the beginning of the line
• [^^] - matches a character that isn't a caret/'^'
• ^[^^] - matches a character that isn't a caret at the beginning of line
• ^[^.]. - matches anything but a literal period, followed by "any" character, at the beginning of line
• [a-z] - matches exactly one character within the range of 'a' to 'z' (i.e. all lowercase letters)
• [az-] - matches either an 'a', a 'z', or a '-' (literal dash)
• [.*]* - matches a contiguous sequence (possibly empty) of dots and asterisks
• [aeiou]{3} - matches 3 consecutive lowercase vowels (all not necessarily the same vowel)
• \[aeiou\] - matches the string "[aeiou]"

References

• regular-expressions.info/Character class, Anchors, Dot, Repetition

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Answer 2

To explain: The ^ at the start of a character class will negate that class But it has to be inside the class for that to work. The same character outside a character class is the anchor for start of string/line instead.

You can try this instead:

"[^0-9]"