# Page History

## Key

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*"One Thousand Five Hundred" =~ "(T[Expressions Examples^ ])"
returns: Thousand

• "One Thousand Five Hundred" =~ "T[Expressions Examples^ ]"
returns: 8
• "One Thousand Five Hundred" : "T[Expressions Examples^ ]"
returns: 0
• "8015551212" : "(...)"
returns: 801
• "3075551212":"...(...)"
returns: 555
• ! "One Thousand Five Hundred" =~ "T[Expressions Examples^ ]"
returns: 0
(because it applies to the string, which is non-null, which it turns to "0", and then looks for the pattern in the "0", and doesn't find it)
• !( "One Thousand Five Hundred" : "T[Expressions Examples^ ]+" )
returns: 1
(because the string doesn't start with a word starting with T, so the match evals to 0, and the ! operator inverts it to 1 )
• 2 + 8 / 2
returns: 6
(because of operator precedence; the division is done first, then the addition)
• 2+8/2
returns: 6
Spaces aren't necessary
• (2+8)/2
returns: 5
of course
• (3+8)/2
returns: 5.5
• TRUNC((3+8)/2)
returns: 5
• FLOOR(2.5)
returns: 2
• FLOOR(-2.5)
returns: -3
• CEIL(2.5)
returns: 3
• CEIL(-2.5)
returns: -2
• ROUND(2.5)
returns: 3
• ROUND(3.5)
returns: 4
• ROUND(-2.5)
returns: -3
• RINT(2.5)
returns: 2
• RINT(3.5)
returns: 4
• RINT(-2.5)
returns: -2
• RINT(-3.5)
returns: -4
• TRUNC(2.5)
returns: 2
• TRUNC(3.5)
returns: 3
• TRUNC(-3.5)
returns: -3

Of course, all of the above examples use constants, but would work the same if any of the numeric or string constants were replaced with a variable reference \${CALLERID(num)}, for instance.