What does ([a zA Z0 9 ]) mean?
The bracketed characters [a-zA-Z0-9] mean that any letter (regardless of case) or digit will match. The * (asterisk) following the brackets indicates that the bracketed characters occur 0 or more times. Lees verder »
What does '?' mean in regex?
The question mark indicates zero or one occurrences of the preceding element. For example, colou? r matches both "color" and "colour". * The asterisk indicates zero or more occurrences of the preceding element. For example, ab*c matches "ac", "abc", "abbc", "abbbc", and so on. Lees verder »
What is a zA Z0 9 in Python?
So [a-zA-Z0-9] means "any lowercase or uppercase letter or decimal digit". The bit between { } says how many times to match the preceding expression. In this case, 57 times. So [a-zA-Z0-9]{57} matches any sequence of 57 letters or digits. Lees verder »
What does this regex mean /[0-9]/g?
The regular expression [^0-9] means "any character that is not a digit", and the sed command s/[^0-9]//g means "replace any non-digit character with nothing, then repeat for as many times as possible on every line of input (i.e. not just the first non-digit on each line)". Example: $ echo '1-2 1-2? Lees verder »
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