Hello, I'm trying to add a regex in app.yaml to ignore files with strange names in Google App Engine , but it is not working.
My regular expression:
skip_files:
- [.\~#%&*{}:<>?|\"-!]
I'm getting this error:
appcfg.py: error: Error parsing /home/klarkc/project/dist/app.yaml: while scanning for the next token found character '|' that can not start any token in "/home/klarkc/project/dist/app.yaml", line 49, column 18.
The expression below allows you to match only the alphabetic characters letters A..Z and a..z and numbers 0..9 and symbols - , _ , . , and whitespace see.
Expression:
^[\w\-. ]+$
To do the inverse and allow only the special symbols *&%#^~ , just use the denied ^ list, see below:
Expression:
^[^\w\-. ]+$
You need to escape some characters, see below how your regex should be;
[\.\~#%&\*\{\}\:<>\?\|\-!]
in its original missed escape
. - > Equivalent to any character {} - > to report a number of repeaters ex .{4}
: - > I do not know the functionality, "someone edits" ? - > means that you have to end the expression | - > Operator OU - - > used for groups, type 0-9
The expression below, finds the names files with the characters of the list .\~#%&*{}:<>?|"-!: :
^[^\\#\%\&\*\{\}\:\<\>\?\|\"\-\!]+$
See a use case running on regex101
^ match at the beginning of the line
+ one or more times
$ match at end of line
More examples (perhaps better) in: Skipping Files .
To validate the syntax of the files YAML (before using them):