/usr/lib/pd/extra/zexy/regex-help.pd is in pd-zexy 2.2.5-2.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 | #N canvas 0 31 458 529 10;
#X floatatom 98 295 0 0 0 0 - - -;
#X text 353 6 part of zexy;
#X obj 17 36 regex;
#X text 74 36 -- check whether a symbol matches a regular expression
;
#X symbolatom 267 212 10 0 0 0 - - -;
#X symbolatom 169 167 10 0 0 0 - - -;
#X msg 50 143 case \$1;
#X obj 56 121 tgl 15 0 empty empty empty 0 -6 0 8 -262144 -1 -1 0 1
;
#X obj 46 327 print result;
#X obj 126 327 print details;
#X obj 212 327 print num;
#X obj 245 178 symbol;
#X msg 284 141 Ab;
#X msg 293 170 bA;
#X msg 297 191 bAc;
#X msg 245 145 aba;
#X msg 104 80 list a a a;
#X text 11 352 list of details:;
#X text 124 447 for more info \, see: http://www.delorie.com/gnu/docs/regex/regex_toc.html
;
#X text 34 368 1) ID number of match (in case of multiple matches)
;
#X text 34 417 3) position of the end of the match (or last character
if no match);
#X text 34 388 2) position of the start of the match (or first character
if no match;
#X obj 103 264 regex;
#N canvas 717 266 494 344 META 0;
#X text 12 195 HELP_PATCH_AUTHORS "pd meta" information added by Jonathan
Wilkes for Pd version 0.42.;
#X text 12 25 LICENSE GPL v2;
#X text 12 175 AUTHOR IOhannes m zmoelnig;
#X text 12 45 DESCRIPTION check whether a symbol matches a regular
expression;
#X text 12 5 KEYWORDS control;
#X text 12 75 INLET_0 case list regex;
#X text 12 95 INLET_1 symbol;
#X text 12 115 OUTLET_0 float;
#X text 12 135 OUTLET_1 list;
#X text 12 155 OUTLET_2 float;
#X restore 402 495 pd META;
#X msg 125 139 list aba Aa Ac;
#X msg 222 89 list bA bA;
#X connect 4 0 22 1;
#X connect 5 0 22 0;
#X connect 6 0 22 0;
#X connect 7 0 6 0;
#X connect 11 0 22 0;
#X connect 12 0 11 0;
#X connect 13 0 11 0;
#X connect 14 0 11 0;
#X connect 15 0 11 0;
#X connect 16 0 22 0;
#X connect 22 0 0 0;
#X connect 22 0 8 0;
#X connect 22 1 9 0;
#X connect 22 2 10 0;
#X connect 24 0 22 0;
#X connect 25 0 22 0;
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