Revisions to Regular expression for alphanumeric and underscores

Add Perl syntax highlighting

edited Oct 28, 2023 at 22:29

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The following regex matches alphanumeric characters and underscore:

^[a-zA-Z0-9_]+$

For example, in Perl:

#!/usr/bin/perl -w my $arg1 = $ARGV[0]; # Check that the string contains *only* one or more alphanumeric chars or underscores if ($arg1 !~ /^[a-zA-Z0-9_]+$/) { print "Failed.\n"; } else { print "Success.\n"; }

#!/usr/bin/perl -w my $arg1 = $ARGV[0]; # Check that the string contains *only* one or more alphanumeric chars or underscores if ($arg1 !~ /^[a-zA-Z0-9_]+$/) { print "Failed.\n"; } else { print "Success.\n"; }

The following regex matches alphanumeric characters and underscore:

^[a-zA-Z0-9_]+$

For example, in Perl:

#!/usr/bin/perl -w my $arg1 = $ARGV[0]; # Check that the string contains *only* one or more alphanumeric chars or underscores if ($arg1 !~ /^[a-zA-Z0-9_]+$/) { print "Failed.\n"; } else { print "Success.\n"; }

The following regex matches alphanumeric characters and underscore:

^[a-zA-Z0-9_]+$

For example, in Perl:

#!/usr/bin/perl -w my $arg1 = $ARGV[0]; # Check that the string contains *only* one or more alphanumeric chars or underscores if ($arg1 !~ /^[a-zA-Z0-9_]+$/) { print "Failed.\n"; } else { print "Success.\n"; }

Fixed the weird syntax highlighting (as a result, the diff looks more extensive than it really is - use view "Side-by-side Markdown" to compare), etc.

Source Link

edited Oct 17, 2022 at 19:52

Peter Mortensen

31.4k
22
110
134

The following regex matches alphanumeric characters and underscore:

^[a-zA-Z0-9_]+$

^[a-zA-Z0-9_]+$

For example, in Perl:

#!/usr/bin/perl -w my $arg1 = $ARGV[0]; # checkCheck that the string contains *only* one or more alphanumeric chars or underscores if ($arg1 !~ /^[a-zA-Z0-9_]+$/) { print "Failed.\n"; } else { print "Success.\n"; }

The following regex matches alphanumeric characters and underscore:

^[a-zA-Z0-9_]+$

For example, in Perl:

#!/usr/bin/perl -w my $arg1 = $ARGV[0]; # check that the string contains *only* one or more alphanumeric chars or underscores if ($arg1 !~ /^[a-zA-Z0-9_]+$/) { print "Failed.\n"; } else { print "Success.\n"; }

The following regex matches alphanumeric characters and underscore:

^[a-zA-Z0-9_]+$

For example, in Perl:

#!/usr/bin/perl -w my $arg1 = $ARGV[0]; # Check that the string contains *only* one or more alphanumeric chars or underscores if ($arg1 !~ /^[a-zA-Z0-9_]+$/) { print "Failed.\n"; } else { print "Success.\n"; }

Added full regex

Source Link

edited Dec 5, 2008 at 4:52

Jay

42.9k
14
69
83

The following regex matches alphanumeric characters and underscore:

[a^[a-zA-Z0-9_]9_]+$

For example, in Perl:

#!/usr/bin/perl -w my $arg1 = $ARGV[0]; # check that the string contains *only* one or more alphanumeric chars or underscores if ($arg1 !~ /^[a-zA-Z0-9_]+$/) { print "Failed.\n"; } else { print "Success.\n"; }

The following regex matches alphanumeric characters and underscore:

[a-zA-Z0-9_]

For example, in Perl:

#!/usr/bin/perl -w my $arg1 = $ARGV[0]; # check that the string contains *only* one or more alphanumeric chars or underscores if ($arg1 !~ /^[a-zA-Z0-9_]+$/) { print "Failed.\n"; } else { print "Success.\n"; }

The following regex matches alphanumeric characters and underscore:

^[a-zA-Z0-9_]+$

For example, in Perl:

#!/usr/bin/perl -w my $arg1 = $ARGV[0]; # check that the string contains *only* one or more alphanumeric chars or underscores if ($arg1 !~ /^[a-zA-Z0-9_]+$/) { print "Failed.\n"; } else { print "Success.\n"; }

Source Link

answered Dec 3, 2008 at 4:31

Jay

42.9k
14
69
83

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