regex in Vietnamese characters

Question

I have one string and want remove any character not in any case below:

• not in this list : ÀÁÂÃÈÉÊÌÍÒÓÔÕÙÚĂĐĨŨƠàáâãèéêìíòóôõùúăđĩũơƯĂẠẢẤẦẨẪẬẮẰẲẴẶẸẺẼỀỀỂ ưăạảấầẩẫậắằẳẵặẹẻẽềềểỄỆỈỊỌỎỐỒỔỖỘỚỜỞỠỢỤỦỨỪễệỉịọỏốồổỗộớờởỡợụủứừỬỮỰỲỴÝỶỸửữựỳỵỷỹ

• not in [a-z 0-9 A-Z]

• not is : _ and white space.

can anyone help me with this regex in php?

Answer 1

Try this regular expression:

/[^a-z0-9A-Z_ÀÁÂÃÈÉÊÌÍÒÓÔÕÙÚĂĐĨŨƠàáâãèéêìíòóôõùúăđĩũơƯĂẠẢẤẦẨẪẬẮẰẲẴẶẸẺẼỀỀỂưăạảấầẩẫậắằẳẵặẹẻẽềềểỄỆỈỊỌỎỐỒỔỖỘỚỜỞỠỢỤỦỨỪễệỉịọỏốồổỗộớờởỡợụủứừỬỮỰỲỴÝỶỸửữựỳỵỷỹ]/u

The u modifier makes PHP to interpret the pattern string as UTF-8.

If that doesn’t work, try using Unicode character properties like \p{L} for letters or the escape sequence \x{1234} for describing single Unicode characters or custom character ranges:

/[^a-z0-9A-Z_\x{00C0}-\x{00FF}\x{1EA0}-\x{1EFF}]/u

Answer 2

$newtext = preg_replace('/[^a-z0-9A-Z_[:space:]ÀÁÂÃÈÉÊÌÍÒÓÔÕÙÚĂĐĨŨƠàáâãèéêìíòóôõùúăđĩũơƯĂẠẢẤẦẨẪẬẮẰẲẴẶẸẺẼỀỀỂ ưăạảấầẩẫậắằẳẵặẹẻẽềềểỄỆỈỊỌỎỐỒỔỖỘỚỜỞỠỢỤỦỨỪễệỉịọỏốồổỗộớờởỡợụủứừỬỮỰỲỴÝỶỸửữựỳỵỷỹ]/u','',$text);