java - 如何编写正则表达式以从字符串中删除所有字母字符

Question

java - 如何使用java / android中的正则表达式从字符串中删除所有字母字符？

val = val.replaceAll("/A/z","");

Answer 1

Try this:

replaceAll("[a-z]", "");

Also have a look here:

Replace all characters not in range (Java String)

Answer 2

Have a look into Unicode properites:

\p{L} any kind of letter from any language

So your regex would look like this

val = val.replaceAll("\\p{L}+","");

To remove also combined letters use a character class and add \p{M}

\p{M} a character intended to be combined with another character (e.g. accents, umlauts, enclosing boxes, etc.)

Then you end here:

val = val.replaceAll("[\\p{L}\\p{M}]+","");

Answer 3

This will remove all alphabetical characters

    String text = "gdgddfgdfh123.0114cc";
    String numOnly = text.replaceAll("\\p{Alpha}","");