image-type-header-regexps

image-type-header-regexps is a variable defined in `image.el'.
Its value is shown below.

• This variable may be risky if used as a file-local variable.

Documentation:
Alist of (REGEXP . IMAGE-TYPE) pairs used to auto-detect image types.
When the first bytes of an image file match REGEXP, it is assumed to
be of image type IMAGE-TYPE if IMAGE-TYPE is a symbol. If not a symbol,
IMAGE-TYPE must be a pair (PREDICATE . TYPE). PREDICATE is called
with one argument, a string containing the image data. If PREDICATE returns
a non-nil value, TYPE is the image's type.

Value:

(("\\`/[	\n
 ]*\\*.*XPM.\\*/" . xpm)
 ("\\`P[1-6]\\(?:\\(?:\\(?:#[^
\n]*[
\n]\\)?[[:space:]]\\)+\\(?:\\(?:#[^
\n]*[
\n]\\)?[0-9]\\)+\\)\\{2\\}" . pbm)
 ("\\`GIF8[79]a" . gif)
 ("\\`\211PNG
\n\n" . png)
 ("\\`[	\n
 ]*#define \\([a-z0-9_]+\\)_width [0-9]+\n#define \\1_height [0-9]+\n\\(#define \\1_x_hot [0-9]+\n#define \\1_y_hot [0-9]+\n\\)?static \\(unsigned \\)?char \\1_bits" . xbm)
 ("\\`\\(?:MM\\*\\|II\\*\\)" . tiff)
 ("\\`[	\n
 ]*%!PS" . postscript)
 ("\\`\377\330" . jpeg)
 ("\\(?:<\\?xml[ 	
\n]+[^>]*>\\)?[ 	
\n]*<\\(?:!--\\(?:[^-]\\|-[^-]\\)*-->[ 	
\n]*<\\)*\\(?:!DOCTYPE[ 	
\n]+[^>]*>[ 	
\n]*<[ 	
\n]*\\(?:!--\\(?:[^-]\\|-[^-]\\)*-->[ 	
\n]*<\\)*\\)?[Ss][Vv][Gg]" . svg))