in reply to regex logical equivalence?

Just to make things more confusing ;) I'm going to swap the order of these two expressions, so my first one will be the longer of the two and I'll work on the the shorter (my second - your first) as I think that's the one you wanted to focus on.

To determine if your two regular expressions are suffiently equivalent we need to compare them.

and this the shorter:/.* # Stuff ( # START capturing to $1 [$\ \#\%>~] # Any single space, $, #, %, > or ~ | # OR \[* # 0 or more [s \w* # 0 or more word characters (a-zA-Z0-9_) \@* # 0 or more @s \-* # 0 or more -s \w* # more word characters \% # Exactly 1 % \]* # 0 or more ]s | # OR \[*\w*\@*\-*\w*\#\]* # As above, but with a # instead of % | # OR \[*\w*\@*\-*\w*\$\]* # As above, but with a $ | # OR \[*\w*\@*\-*\w*>\]* # As above, but with no terminator # (will therefore match any terminator) | # OR \\\[\\e\[0m\\\]\ \[0m # the sequence: \[\e[0m\\] [0m ) # END of $1 \s? # 0 or 1 spaces /x

/.* # Stuff ( # START capturing to $1 \[* # 0 or more [s \w* # 0 or more word characters \@* # 0 or more @s \-* # 0 or more -s \w* # more word characters [$\ \#\%>~] # exactly 1 space, $, #, %, > or ~ \] # exactly 1 ] (are you missing a * ?) | # OR \\\[\\e\[0m\\\]\ \[0m # the sequence: \[\e[0m\\] [0m ) # END of $1 \s? # 0 or 1 spaces /x

- Any 1 space, $, #, %, > or ~ will be matched by both.
- The escape sequence:
`\[\e[0m\\] [0m`is allowed by both. - Each pattern:
`[w@-w$], [w@-w#], [w@-w%], [w@-w~]`is allowed by both. `[w@-w ]`is (as you shown) is allowed by the second but not the first (this is easy to fix)

Like you, I can only spot this one significant difference between the two regular expressions (once you fix your typo).

/.* # Stuff ( # START capturing to $1 \ # exactly 1 space | # OR \[* # 0 or more [s \w* # 0 or more word characters \@* # 0 or more @s \-* # 0 or more -s \w* # more word characters [$\#\%>~] # exactly 1 of $, #, %, > or ~ \]* # 0 or more ]s | # OR \\\[\\e\[0m\\\]\ \[0m # the sequence: \[\e[0m\\] [0m ) # END of $1 \s? # 0 or 1 spaces /x

/.* # Stuff ( # START capturing to $1 \ # exactly 1 space | # OR \[? # 0 or 1 [ \w* # 0 or more word characters \@? # 0 or 1 @ [-\w.]* # 0 or more word chars, dots and hyphens eg +w-w.w-.w [$\#\%>~] # exactly 1 of $, #, %, > or ~ \]? # 0 or 1 ] | # OR \\\[\\e\[0m\\\]\ \[0m # the sequence: \[\e[0m\\] [0m ) # END of $1 \s? # 0 or 1 spaces /x

But I may be wrong - you may not be interested in the dot at all. ;) I'm not 100% certain that you want the .* at the front though. Do you have some sample data for us?

I hope you recognise that both expressions will match any string with a single space in it... which will be most strings....

I hope this helps.

jarich

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