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Re: Need a regular expression to check the first digit -- YAPE::Regex::Explain

by Discipulus (Abbot)
on May 19, 2021 at 06:53 UTC ( #11132729=note: print w/replies, xml ) Need Help??


in reply to Need a regular expression to check the first digit

Hello chandantul,

you already received good hints. A minimal read of the manual is something to do.

Here the explanation of your regex:

perl -MYAPE::Regex::Explain -e "print YAPE::Regex::Explain->new(qr/^[5 +]+$/)->explain()" The regular expression: (?-imsx:^[5]+$) matches as follows: NODE EXPLANATION ---------------------------------------------------------------------- (?-imsx: group, but do not capture (case-sensitive) (with ^ and $ matching normally) (with . not matching \n) (matching whitespace and # normally): ---------------------------------------------------------------------- ^ the beginning of the string ---------------------------------------------------------------------- [5]+ any character of: '5' (1 or more times (matching the most amount possible)) ---------------------------------------------------------------------- $ before an optional \n, and the end of the string ---------------------------------------------------------------------- ) end of grouping ----------------------------------------------------------------------

L*

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Re^2: Need a regular expression to check the first digit -- YAPE::Regex::Explain
by chandantul (Scribe) on May 23, 2021 at 01:51 UTC

    Thanks everyone for your responses, i have resolved the issue with below regex.

    /^[5](?=\d)

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