Eclipse regular expression search and replace

Question

In eclipse  is it possible to use the matched search string as part of the replace string when performing a regular expression search and replace   Basically  I want to replace all occurrences of  variableName someMethod     with     TypeName variableName someMethod      Where variableName can be any variable name at all   In sed I could use something like   s  a-zA-Z    someMethod       TypeName  amp   g   That is   amp  represents the matched search string  Is there something similar in Eclipse   Thanks

User · Accepted Answer

Yes      captures a group  You can use it again with  i where i is the i th capture group  So   search    w   someMethod      replace    TypeName  1   Hint  Ctrl   Space in the textboxes gives you all kinds of suggestions for regular expression writing

User · Answer

At least at STS  SpringSource Tool Suite  groups are numbered starting form 0  so replace string will be  replace    TypeName  0

User · Answer

Using       search        import                  replace    1 2       replaces      from checks import checklist  list        with     from checks import checklist    Blocks in regex are delineated by parenthesis  which are not preceded by a           import   finds  from checks import   and loads it to  1  eclipse starts counting at 1        find the next  everything  until the next encountered     and loads it to  2   2 stops at the     because of the next part  see next line below             says  at the first encountered     after starting block  2   stop block  2 and start  3   3 gets loaded with the    any text     or  in the example  the    list      Then in the replace  just put the  1 2 to replace all three blocks with just the first two

User · Answer

For someone who needs an explanation and an example of how to use a regxp in Eclipse  Here is my example illustrating the problem     I want to rename   download mp4 lecture id 271   to    271 mp4   And there can be multiple of these   Here is how it should be done     Then hit find replace button

User · Answer

NomeN has answered correctly  but this answer wouldn t be of much use for beginners like me because we will have another problem to solve and we wouldn t know how to use RegEx in there  So I am adding a bit of explanation to this  The answer is  search    w    someMethod        replace    TypeName  1   Here  In search   First and last      depicts a group in regex   w depicts words  alphanumeric   underscore     depicts one or more  ie one or more of alphanumeric   underscore     is a special character which depicts any character  ie    means one or more of any character   Because this is a special character to depict a   we should give an escape character with it  ie     someMethod is given as it is to be searched   The two parenthesis      are given along with escape character because they are special character which are used to depict a group  we will discuss about group in next point    In replace   It is given   TypeName  1   here  1 depicts the group   That is all the characters that are enclosed within the first and last parenthesis      in the search field  Also make sure you have checked the  Regular expression  option in find an replace box

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