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/g means to do the match repeatedly
with s///g, replace all occurrences (non-overlapping)
with m//g, find all matches, starting each where the previous one finished
m//g in list context returns a list of all matching strings:
"Madagascar" =~ m/a./g; # returns ('ad', 'ag', 'as', 'ar')
Extract all the numerals from a string:
"12-345:6 78" =~ m/\d+/g; # returns ('12', '345', '6', '78')
Note that this does not return 2 or 34 or 45
Each m//g picks up where the previous match ended
Split a string into fixed-length substrings:
@substrings = "abcdefghijklmnopqrstuvwxyz" =~ /.{1,5}/g;
# Yields ('abcde', 'fghij, 'klmno', 'pqrst', 'uvwxy', 'z')
Notice importance of greed here - what if we had used .{1,5}? ?
To omit z, use .{5} instead of .{1,5}
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Copyright © 2002 M. J. Dominus |