Replace all non-alphanumeric characters in a string

Question

I have a string with which i want to replace any character that isn t a standard character or number such as  a-z or 0-9  with an asterisk  For example   h  amp ell    o w   orld  is replaced with  h ell o w orld   Note that multiple characters such as    amp   get replaced with one asterisk  How would I go about doing this

User · Answer

Use  W which is equivalent to   a-zA-Z0-9    Check the documentation  https   docs python org 2 library re html  Import re s     h  amp ell    o w   orld  replaced string   re sub r  W         s  output   h ell o w orld    update  This solution will exclude underscore as well  If you want only alphabets and numbers to be excluded  then solution by nneonneo is more appropriate

User · Answer

Try   s   filter str isalnum  s    in Python3   s      join filter str isalnum  s     Edit  realized that the OP wants to replace non-chars with      My answer does not fit

User · Answer

The pythonic way   print    join   c if c isalnum   else     for c in s      This doesn t deal with grouping multiple consecutive non-matching characters though  i e     h  amp i   gt   h  i not  h i  as in the regex solutions

User · Answer

Regex to the rescue   import re  s   re sub    0-9a-zA-Z          s    Example    gt  gt  gt  re sub    0-9a-zA-Z           h  amp ell    o w   orld    h ell o w orld

[python] Replace all non-alphanumeric characters in a string

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