Home » Java regex for removing all single letters except “a” and “i” from string [closed]

Java regex for removing all single letters except “a” and “i” from string [closed]

Solutons:


Code

See regex in use here

(?:^| )[b-hj-z](?= |$)

Usage

See code in use here

import java.util.regex.Matcher;
import java.util.regex.Pattern;

class Ideone
{
    public static void main (String[] args) throws java.lang.Exception
    {
        final String regex = "(?:^| )[b-hj-z](?= |$)";
        final String string = "there i r u w want to y z go because f g of a matter";
        final String subst = "";

        final Pattern pattern = Pattern.compile(regex);
        final Matcher matcher = pattern.matcher(string);

        // The substituted value will be contained in the result variable
        final String result = matcher.replaceAll(subst);

        System.out.println("Substitution result: " + result);
    }
}

If you need case-insensitive matching you pass Pattern.CASE_INSENSITIVE to Patter.compile.


Results

Input

there i r u w want to y z go because f g of a matter

Output

there i want to go because of a matter

Explanation

  • (?:^| ) Assert position at the start of the line or match a space literally
  • [b-hj-z] Match any lowercase ASCII letter except a or i
  • (?= |$) Positive lookahead ensuring what follows is a space or the end of the line

Working sample code to remove all single letters except “a” and “i”

String resultStr = "there i r u w want to y z go because f g of a matter".replaceAll("(?:^| )[b-hj-z | B-HJ-Z](?= |$)", "");

Explanation:

enter image description here

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