(diff.info.gz) Specified Folding

 
 Suppressing Lines Matching a Regular Expression
 ===============================================
 
    To ignore insertions and deletions of lines that match a
 `grep'-style regular expression, use the `-I REGEXP' or
 `--ignore-matching-lines=REGEXP' option.  You should escape regular
 expressions that contain shell metacharacters to prevent the shell from
 expanding them.  For example, `diff -I '^[[:digit:]]'' ignores all
 changes to lines beginning with a digit.
 
    However, `-I' only ignores the insertion or deletion of lines that
 contain the regular expression if every changed line in the hunk--every
 insertion and every deletion--matches the regular expression.  In other
 words, for each nonignorable change, `diff' prints the complete set of
 changes in its vicinity, including the ignorable ones.
 
    You can specify more than one regular expression for lines to ignore
 by using more than one `-I' option.  `diff' tries to match each line
 against each regular expression.

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