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clarify substring documentation

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git-svn-id: https://origsvn.digium.com/svn/asterisk/branches/1.2@7470 65c4cc65-6c06-0410-ace0-fbb531ad65f3
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Kevin P. Fleming
2005-12-13 18:54:22 +00:00
parent fb0ffc7784
commit 2ede900bfd
1 changed files with 7 additions and 7 deletions
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14
doc/README.variables
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@@ -94,17 +94,17 @@ NoOp(${__FOO}) is identical to NoOp(${FOO})
_______________________________ ___________________________________
REMOVING CHARACTERS FROM STRING SELECTING CHARACTERS FROM VARIABLES
------------------------------- -----------------------------------
The format for removing characters from a variable can be expressed as: The format for selecting characters from a variable can be expressed as:
${variable_name[:offset[:length]]} ${variable_name[:offset[:length]]}
If you want to remove the first N characters from the string assigned If you want to select the first N characters from the string assigned
to a variable, simply append a colon and the number of characters to to a variable, simply append a colon and the number of characters to
remove from the beginning of the string to the variable name. skip from the beginning of the string to the variable name.
;Remove the first character of extension, save in "number" variable ;Remove the first character of extension, save in "number" variable
exten => _9X.,1,Set(number=${EXTEN:1}) exten => _9X.,1,Set(number=${EXTEN:1})
@@ -115,7 +115,7 @@ dial a number to access an outside line, but do not wish to pass the first
digit. digit.
If you use a negative offset number, Asterisk starts counting from the end If you use a negative offset number, Asterisk starts counting from the end
of the string and then removes everything before the new position. The following of the string and then selects everything after the new position. The following
example will save the numbers 1234 to the 'number' variable, still assuming example will save the numbers 1234 to the 'number' variable, still assuming
we've dialed 918005551234. we've dialed 918005551234.