Extract a substring from a string in Ruby using a regular expression

Question

How can I extract a substring from within a string in Ruby   Example   String1     lt name gt   lt substring gt     I want to extract substring from String1  i e  everything within the last occurrence of  lt  and  gt

User · Answer

lt name gt   lt substring gt       lt     gt      1    gt   substring    No need to use scan  if we need only one result  No need to use Python s match  when we have Ruby s String regexp      See  http   ruby-doc org core String html method-i-5B-5D  Note  str regexp  capture    new str or nil

User · Answer

A simpler scan would be    String1 scan   lt   S   gt    last

User · Answer

String1 scan   lt     gt     gt    last first   scan creates an array which  for each  lt item gt  in String1 contains the text between the  lt  and the  gt  in a one-element array  because when used with a regex containing capturing groups  scan creates an array containing the captures for each match   last gives you the last of those arrays and first then gives you the string in it

User · Answer

Here s a slightly more flexible approach using the match method   With this  you can extract more than one string   s     lt ants gt   lt pants gt   matchdata   s match   lt     gt     gt   lt     gt     gt       Use  captures  to get an array of the captures matchdata captures       ants   pants      Or use raw indices matchdata 0      whole regex match    lt ants gt   lt pants gt   matchdata 1      first capture   ants  matchdata 2      second capture   pants

User · Answer

You can use a regular expression for that pretty easily     Allowing spaces around the word  but not keeping them    str match   lt       gt       gt  Z   1    Or without the spaces allowed    str match   lt     gt     gt  Z   1

[ruby] Extract a substring from a string in Ruby using a regular expression

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