OR condition in Regex

Question

Let s say I have  1 ABC Street 1 A ABC Street   With  d  it matches 1  what I expect   with  d  w  it matches 1 A  expected   When I combine the patterns together  d  d  w  it matches only the first one but ignores the second one   My question is how to use  or  condition correctly in this particular case   PS  The condition is wrapping the number only when there is no single letter after that  otherwise wrap the number and the single letter   Example  1 ABC Street match number 1 only  but when 1 A ABC Street wrap the 1 A

User · Answer

A classic  or  would be    For example  ab de would match either side of the expression   However  for something like your case you might want to use the   quantifier  which will match the previous expression exactly 0 or 1 times  1 times preferred  i e  it s a  greedy  match   Another  probably more relyable  alternative would be using a custom character group    d  s  A-Z s   s  A-Z  A-Za-z     This pattern will match     d   One or more numbers   s   One or more whitespaces   A-Z s    One or more uppercase characters or space characters  s   One or more whitespaces   A-Z  A-Za-z s    An uppercase character followed by at least one more character  uppercase or lowercase  or whitespaces      If you d like a more static check  e g  indeed only match ABC and A ABC  then you can combine a  non-matching  group and define the alternatives inside  to limit the scope     d    ABC A ABC  Street   Or another alternative using a quantifier    d    A   ABC Street

User · Answer

Try   d  w   d   or add a positive lookahead if you don t want to include the trailing space in the match   d  w       d   When you have two alternatives where one is an extension of the other  put the longer one first  otherwise it will have no opportunity to be matched

User · Answer

I think what you need might be simply    d   w     Note that your regex would have worked too if it was written as  d  w  d instead of  d  d  w   This is because in your case  once the regex matches the first option   d  it ceases to search for a new match  so to speak

[regex] OR condition in Regex

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