CODEWITHSUNDEEP
bash
AskMath
AskMath

Reputation: 425

How can I check if string is from this format?

How can I check if a string in bash is from this format: exerciseNumber{N}Published while {N} is some natural number.

for example: 

for file in `ls`; do
  if (( `isInRequiredFormat ${file}` )); then
    echo Yes.
  fi
done

And I ask for how can I write the function "isInRequiredFormat" according to the format the I writed.

Upvotes: 0

Views: 58

Answers (2)

chepner
chepner

Reputation: 531808

Just use (extended) pattern matching:

shopt -s extglob
for file in *; do
  if [[ $file = exerciseNumber@(0|[1-9]*([0-9]))Published ]]; then
    echo yes
  fi
done

@(x|y) matches either x or y. *(x) matches 0 or more occurrences of x. So @(0|[1-9]*([0-9])) matches either 0, or it matches a non-zero digit optionally followed by any number of digits.

Upvotes: 3

kpie
kpie

Reputation: 11110

you can use a regular expression.

for file in `ls`; do
  if [[ $file =~ exerciseNumber[:digit:]*Published ]]; then
    echo Yes.
  fi
done

Upvotes: 0

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