t:trimLeft

Description: Removes leading whitespace from a string.

This transformation function removes \x20\t\n\r\f\v characters from the beginning of the input string.

Syntax: t:trimLeft

Implemented: Yes

Example:

# Detect after trimming leading whitespace from parameter
SecRule ARGS:username "@rx ^admin" \
    "id:1,phase:2,t:trimLeft,deny,msg:'admin username detected'"

# Original input: "   admin"
# After processing: "admin"