RegEx for all strings with certain number

Question

I want to identify all strings that contain the number 5 after finger_ or ground_. This should ignore the number at the end (regardless of if it ends with phase_ or env_).

Here are some examples:

finger_5_ground_4_phase_92 = YES
finger_1_ground_2_phase_9 = NO
finger_4_ground_2_phase_5 = NO
finger_4_ground_2_env_5 = NO
finger_4_ground_5_env_5 = YES

What language will you be using? Different languages may have slightly different regex syntax/support... — Castaglia, Jan 29 '16 at 22:53

score 0 · Answer 1 · answered Jan 29 '16 at 23:29

Use:

    Pattern pattern = Pattern.compile(".*(?:finger|ground)_5.*");
    System.out.println(String.format("%s = %s", "finger_5_ground_4_phase_92", pattern.matcher("finger_5_ground_4_phase_92").matches() ? "YES" : "NO"));
    System.out.println(String.format("%s = %s", "finger_1_ground_2_phase_9", pattern.matcher("finger_1_ground_2_phase_9").matches() ? "YES" : "NO"));
    System.out.println(String.format("%s = %s", "finger_4_ground_2_phase_5", pattern.matcher("finger_4_ground_2_phase_5").matches() ? "YES" : "NO"));
    System.out.println(String.format("%s = %s", "finger_4_ground_2_env_5", pattern.matcher("finger_4_ground_2_env_5").matches() ? "YES" : "NO"));
    System.out.println(String.format("%s = %s", "finger_4_ground_5_env_5", pattern.matcher("finger_4_ground_5_env_5").matches() ? "YES" : "NO"));

vinycd · Accepted Answer · 2016-01-29T23:50:20.553

-2

Use this:

.*(finger|ground)_5_.*

edited Jan 29 '16 at 23:50

answered Jan 29 '16 at 22:58

vinycd

97
4

1

Why are you escaping the `*` characters? That will treat them literally, but there are no `*` characters in the strings. – Barmar Jan 29 '16 at 23:15
the * character in regex means zero or more times and . character means any character. – vinycd Jan 29 '16 at 23:47
I know what it means. But escaping it with backslash disables that meaning. – Barmar Jan 29 '16 at 23:48
There's also no need to escape `_`, it doesn't have any special meaning. – Barmar Jan 29 '16 at 23:49
My bad, I just copy and forgot to remove the backslash – vinycd Jan 29 '16 at 23:49

RegEx for all strings with certain number

2 Answers2