How do I prepare a regular expression that avoids partial digits when matched?

Question

How do I prepare a regular expression that avoids partial digits when matched?

I am using pcre_exec()

regular expressions to compile.

I want to match a string with a three-digit number followed by "-", but it shouldn't match if the number is prefixed with one or more digits. eg.

345- => match and matches text => (345-)
:546- = match and matches text => (546-)
 123- = match and matches text => (123-)
2355- = Should not match as 355- is prefixed with "2" digit.

I tried ^([\\s|:]*)([0-7]\\d{2})-

it but it doesn't work.

+3

c ++ regex pcre

balaji Dec 16 14 at 13:37

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1 answer

nhahtdh · Accepted Answer · 2014-12-16T13:39:40+0000

Use look-behind to assert that the previous character is not a digit:

(?<!\d)([0-7]\d{2})-

How do I prepare a regular expression that avoids partial digits when matched?

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