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I am parsing the request parameters to find any vulnerable characters to prevent XSS threats. Our web application supports both French and German languages other than English. I am using the following regular expression to achieve this, but it fails to handle French and German
^[a-zA-Z0-9\r\n\\-=\\*\\.\\?;,+\\/:&_ %@#]*$
Any suggestions on this is highly appreciated
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Short answer: yes.
To match a character having special meaning in regex, you need to use a escape sequence prefix with a backslash ( \ ). E.g., \. matches "." ; regex \+ matches "+" ; and regex \( matches "(" . You also need to use regex \\ to match "\" (back-slash).
Matching a Single Character Using Regex ' dot character in a regular expression matches a single character without regard to what character it is. The matched character can be an alphabet, a number or, any special character.
\p{L} will match any unicode character that is a letter.
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