Validate Cron Expression

Check if a cron expression has valid format with 5 fields.

Code

Utilities

# Validate 5-field cron expression
field='([0-9*,/-]+)'
pattern="^${field} ${field} ${field} ${field} ${field}$"
if [[ "$expr" =~ $pattern ]]; then
  echo "valid"
else
  echo "invalid"
fi

Parameters

expr(string)

Cron expression to validate.

Server

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