Regular Expression..

[vasanth]

Can anyone help me formulate a regular expression for the following

The valid entries are


49837659465
65986749569435
85645094
+564385639
+4234
+1
+68465945


So anything with just numbers or a + in front of the numbers is valid...

thanx in advance....

[laserlight]

hmm... assuming it is Perl compatible, what about
/^\+[0-9]+$/
or
/^\+\d+$/

[vasanth]

thanx.... I better learn regular expressions properly.. seems really usefull..

[laserlight]

hehe, coming back to this thread I just realised I gave a wrong pattern and no one corrected me.

Those patterns would not match the digits only expressions.

You should use:
/^\+?\d+$/

I'm using slashes as pattern delimiters, while ^ indicates the start, $ the end.
\+ is a literal plus symbol, having been escaped.
? means 0 or 1 instances of the character/subpattern that precedes it.
\d should be equivalent to [0-9], meaning a character from 0 to 9.
then + means 1 or more instances of the character/subpattern that precedes it.