The Rename Rules use the full power of the Perl Regular expression engine to perform search and replace on the pin_names. The following example describes a powerful set of regular expression used to rename some strangely named clk output pins found in a TI data sheet (for the LMK00338 device) . The 4 regular expression replace rules start on line 7. As the block below describes, those 4 rules can do the work of the 20 rules that are expanded below them.

#rename rules for clock out diff_pairs
#These rename rules were used with a TI clk buffer chip which named its clock output pins
# clkouta0 and clkouta0* 
#we want to rename clkouta0 to clockouta0_p and clkouta0* to clkouta0_n
#Using the power of Regular Expressions, we can get all of the signals renamed with the following REPLACE_RULES

(CLKOUT[AB]\d+)$:$1_P
(CLKOUT[AB]\d+)[*]$:$1_N
(CLKIN\d+)$:$1_P
(CLKIN\d+)[*]$:$1_N

#the $ in the regular expression says the match must occur at the end of the string.
#The CLKOUT[AB]\d+ says the match has to have CLKOUT followed by A or B, followed by any number of digits (0-9).
#The Parenthesis tell the Regular Experession engine to capture everything that matches between the Parenthesis in the $1 variable.
#Then we can use the $1 Variable and append the  _P or _N to it.
#so when PartBuilder sees CLKOUTA0, the first Regular expression matches it and CLKOUTA0 is stored in $1
#We then replace it with $1_P so we get CLKOUTA0_P
#when PartBuilder sees CLKOUTA1*, the 2nd Regular expression matches it and CLKOUTA1 is stored in $1 (without the asterix since it is outside the parenthesis).
#We then replace it with $1_N so we get CLKOUTA0_N



#if we want to avoid using the advanced Regular expression constructs, we could enter every match by hand
# Like this: Note they are all commented out here 

#CLKOUTA0:CLKOUTA0_P
#CLKOUTA0*:CLKOUTA0_N
#CLKOUTA1:CLKOUTA1_P
#CLKOUTA1*:CLKOUTA1_N
#CLKOUTA2:CLKOUTA2_P
#CLKOUTA2*:CLKOUTA2_N
#CLKOUTA3:CLKOUTA3_P
#CLKOUTA3*:CLKOUTA3_N

#CLKOUTB0:CLKOUTB0_P
#CLKOUTB0*:CLKOUTB0_N
#CLKOUTB1:CLKOUTB1_P
#CLKOUTB1*:CLKOUTB1_N
#CLKOUTB2:CLKOUTB2_P
#CLKOUTB2*:CLKOUTB2_N
#CLKOUTB3:CLKOUTB3_P
#CLKOUTB3*:CLKOUTB3_N

#CLKIN0:CLKIN0_P
#CLKIN0*:CLKIN0_N

#CLKIN1:CLKIN1_P
#CLKIN1*:CLKIN1_N

Here is the sample STATUS window output (with DEBUG messages enabled) Aftr running the SIG_RENAME_RULE operation.

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