Split a character string based on change of character
- Task
Split a (character) string into comma (plus a blank) delimited strings based on a change of character (left to right).
Show the output here (use the 1st example below).
Blanks should be treated as any other character (except
they are problematic to display clearly). The same applies
to commas.
For instance, the string:
gHHH5YY++///\
should be split and show:
g, HHH, 5, YY, ++, ///, \
Python
<lang python>import itertools
try: input = raw_input except: pass
s = input() groups = [] for _, g in itertools.groupby(s):
groups.append(.join(g))
print(' input string: %s' % s) print(' output string: %s' % ', '.join(groups))</lang>
- Output:
when using the default input
input string: gHHH5YY++///\ output string: g, HHH, 5, YY, ++, ///, \
REXX
<lang rexx>/*REXX program splits a string based on change of character ───► a comma delimited list.*/ parse arg str . /*obtain optional arguments from the CL*/ if str== | str=="," then str= 'gHHH5YY++///\' /*Not specified? Then use the default.*/ p=left(str, 1) /*placeholder for the "previous" string*/ $= /* " " " output " */
do j=1 for length(str); @=substr(str, j, 1) /*obtain a char from string. */ if @\==left(p, 1) then do; $=$',' @; p=; end /*different then previous? */ else $=$ || @ /*a replicated character. */ p=p || @ /*append char to current list*/ end /*j*/
say ' input string: ' str say ' output string: ' $ /*stick a fork in it, we're all done. */</lang> output when using the default input:
input string: gHHH5YY++///\ output string: g, HHH, 5, YY, ++, ///, \