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a is '\*bc'
b is '\'
c is '*'
${a##?*} removes everything: || - matches one char, then all
${a##?"*"} removes \*: |bc| - matches one char, then *
${a##\*} removes nothing: |\*bc| - first char is not *
${a##\\*} removes everything: || - matches \, then all
${a##\\\*} removes \*: |bc| - matches \, then *
${a##?$c} removes everything: || - matches one char, then all
${a##?"$c"} removes \*: |bc| - matches one char, then *
${a##\\$c} removes everything: || - matches \, then all
${a##\\\$c} removes nothing: |\*bc| - matches \, but then second char is not $
${a##\\"$c"} removes \*: |bc| - matches \, then *
${a##$b} removes \: |*bc| - matches \
${a##"$b"} removes \: |*bc| - matches \
Single quote tests:
${a##?'*'} removes \*: |bc| - matches one char, then *
${a##'\'*} removes everything: || - matches \, then all
${a##'\'\*} removes \*: |bc| - matches \, then *
${a##'\*'} removes \*: |bc| - matches \, then *
${a##'\'$c} removes everything: || - matches \, then all
${a##'\'\$c} removes nothing: |\*bc| - matches \, but then second char is not $
${a##'\'"$c"} removes \*: |bc| - matches \, then *
${a##"$b"?} removes \*: |bc| - matches \, then one char
${a##"$b"*} removes everything: || - matches \, then all
${a##"$b""?"} removes nothing: |\*bc| - second char is not ?
${a##"$b""*"} removes \*: |bc| - matches \, then *
${a##"$b"\*} removes \*: |bc| - matches \, then *
${a##"$b"$c} removes everything:|| - matches \, then all
${a##"$b""$c"} removes \*: |bc| - matches \, then *
${a##"$b?"} removes nothing: |\*bc| - second char is not ?
${a##"$b*"} removes \*: |bc| - matches \, then *
${a##"$b$c"} removes \*: |bc| - matches \, then *
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