regex string replace

Question

I am trying to do a basic string replace using a regex expression  but the answers I have found do not seem to help - they are directly answering each persons unique requirement with little or no explanation   I am using str   str replace    a-z0-9   g       at the moment  But what I would like to do is allow all alphanumeric characters  a-z and 0-9  and also the  -  character   Could you please answer this and explain how you concatenate expressions

User · Answer

Just change   to -   str   str replace    a-z0-9-  g         You can read it as          match NOT from the set   a-z0-9-   match if not a-z  0-9 or -    g  do global match   More information    https   developer mozilla org en-US docs JavaScript Guide Regular Expressions

User · Answer

This should work    str   str replace    a-z0-9-  g         Everything between the  indicates what your are looking for     is here to delimit your pattern so you have one to start and one to end    indicates the pattern your are looking for on one specific character   indicates that you want every character NOT corresponding to what follows a-z matches any character between  a  and  z  included 0-9 matches any digit between  0  and  9  included  meaning any digit  - the  -  character g at the end is a special parameter saying that you do not want you regex to stop on the first character matching your pattern but to continue on the whole string   Then your expression is delimited by   before and after   So here you say  every character not being a letter  a digit or a  -  will be removed from the string

User · Answer

Your character class  the part in the square brackets  is saying that you want to match anything except 0-9 and a-z and    You aren t explicit about how many a-z or 0-9 you want to match  but I assume the   means you want to replace strings of at least one alphanumeric character  It should read instead   str   str replace    -a-z0-9   g         Also  if you need to match upper-case letters along with lower case  you should use   str   str replace    -a-zA-Z0-9   g

[javascript] regex string replace

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