Hi there,
i need a regexp to validate formulars like "$a + min($b, $c, $e)"
Please help!
mash4077
i need a regexp to validate formulars like "$a + min($b, $c, $e)"
Please help!
mash4077
Nov 29, 2005, 6:49 AM
User (107 posts)
Nov 29, 2005, 6:49 AM
Post #2 of 2
Views: 3387
The regex needed depends on how the formula is laid out and whether you want to capture anything.
If it is in that same format everytime and you don't want to capture specific parts then sometime like this should work:
\$[a-z] # Something like $a or $b etc.
\s* # Optional space.
[+/\*%-] # Multiplication, addition, subtraction etc...
\s* # Optional space.
[a-z]+ # cos, sin, min etc.
\( # Argument bracket.
[a-z\$,\s]+ # Arguments such as $a, $b, $c etc.
\) # Closing argument bracket.
!xsg) {
print "Got a match!\n";
}
If it is in that same format everytime and you don't want to capture specific parts then sometime like this should work:
Code:
if ($string =~ m! \$[a-z] # Something like $a or $b etc.
\s* # Optional space.
[+/\*%-] # Multiplication, addition, subtraction etc...
\s* # Optional space.
[a-z]+ # cos, sin, min etc.
\( # Argument bracket.
[a-z\$,\s]+ # Arguments such as $a, $b, $c etc.
\) # Closing argument bracket.
!xsg) {
print "Got a match!\n";
}