String Pattern Matching In Java

Question

I want to search for a given string pattern in an input sting   For Eg   String URL    https   localhost 8080 sbs 01 00 sip dreamworks v 01 00 cui print  fwVer   fwVer   lang en  model   model   region us  imageBg   imageBg   imageH   imageH   imageSz   imageSz   imageW   imageW  movie Kung Fu Panda two categories 3D Pix item  item   back 2  uniqueID   uniqueID     Now I need to search whether the string URL contains    item     Please help me   This is an example  Actually I need is check whether the URL contains a string matching    a-zA-Z0-9

User · Answer

If you want to check if some string is present in another string, use something like String.contains

If you want to check if some pattern is present in a string, append and prepend the pattern with '.*'. The result will accept strings that contain the pattern.

Example: Suppose you have some regex a(b|c) that checks if a string matches ab or ac
.*(a(b|c)).* will check if a string contains a ab or ac.

A disadvantage of this method is that it will not give you the location of the match.

User · Answer

You can use the Pattern class for this  If you want to match only word characters inside the    then you can use the following regex   w is a shorthand for  a-zA-Z0-9    If you are ok with   then use  w or else use  a-zA-Z0-9    String URL    https   localhost 8080 sbs 01 00 sip dreamworks v 01 00 cui print  fwVer   fwVer   lang en  model   model   region us  imageBg   imageBg   imageH   imageH   imageSz   imageSz   imageW   imageW  movie Kung Fu Panda two categories 3D Pix item  item   back 2  uniqueID   uniqueID    Pattern pattern   Pattern compile        w         Matcher matcher   pattern matcher URL   if  matcher find          System out println matcher group 0      prints   item     else       System out println  Match not found

User · Answer

You can do it using string indexOf   item     If the result is greater than -1  item  is in the string

User · Answer

That s just a matter of String contains   if  input contains   item       If you need to know where it occurs  you can use indexOf   int index   input indexOf   item     if  index    -1     -1 means  not found                That s fine for matching exact strings - if you need real patterns  e g   three digits followed by at most 2 letters A-C   then you should look into regular expressions   EDIT  Okay  it sounds like you do want regular expressions  You might want something like this   private static final Pattern URL PATTERN       Pattern compile       a-zA-Z0-9                if  URL PATTERN matches input  find

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