replace substring if follows number, eg screen resolution, php

Question

I have looked everywhere but I am stuck and need some help.
I believe I need a regex to replace a quote " (for inches) at the end of a number.
For example 21.5" with 21.5inch
I need to do it only if the " has a number before it. Thanks in advance!

Are there possible whitespaces between the number and quote? — hwnd, Aug 07 '15 at 02:06
Corrected sentences to make problem more clear and highlighted special characters. — MaxZoom, Aug 07 '15 at 02:33

score 1 · Answer 1 · answered Aug 07 '15 at 02:36

1

The regex for this task is

(\d)"

Here is DEMO with explanation

answered Aug 07 '15 at 02:36

MaxZoom

7,619
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Wrong! `\d` does not includes decimal notation `.` Also, it does not forgive space between digit and `"`. – Haywire Aug 07 '15 at 02:39
Who needs decimal character ? – MaxZoom Aug 07 '15 at 02:40
Check OP's post. He himself asked for `21.5inch`. – Haywire Aug 07 '15 at 02:42
The regex provided works for above string, I do not see any issue. – MaxZoom Aug 07 '15 at 02:45
1

No. In your demo link, it matches only `5`. – Haywire Aug 07 '15 at 02:52
@haywire you need to look at how the substitution is being used at the bottom of the demo. – chris85 Aug 07 '15 at 03:45
@chris85 Oh I never noticed that! Thanks! – Haywire Aug 07 '15 at 05:39

lintmouse · Answer 2 · 2015-08-07T02:46:13.017

0

Try this:

(?<=\d)"

https://regex101.com/r/lC9tZ7/2

It should grab the " as long as it follows a digit.

If it can have spaces between the digit and ", try this:

(?<=\d)\s*"

https://regex101.com/r/cT1bF7/3

edited Aug 07 '15 at 02:46

answered Aug 07 '15 at 02:09

lintmouse

5,079
8
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54

Haywire · Answer 3 · 2015-08-07T02:57:07.723

0

Try (\d+\.{0,1}\d+)\s*"

Explanation: Lets try matching 21.54 inch

\d+ matches 21
\.{0,1} escapes decimal notation and matches if there's a . atleast 0 times (i.e., there is no decimal at all) and atmost 1 times (i.e., a number can only have at most 1 decimal). So, we have so far matched 21.
\d+ matches the remaining 54. So far matched 21.54
\s* forgives if there is any space followed by the number
" finally ensures that the number is followed by the inch notation.

Check this demo link here.

edited Aug 07 '15 at 02:57

answered Aug 07 '15 at 02:50

Haywire

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You can safely omit `\s*` if there should not be any space between the number and `"` – Haywire Aug 07 '15 at 02:58
1

You can use the `?` in place of `{0,1}`. – chris85 Aug 07 '15 at 03:41

replace substring if follows number, eg screen resolution, php

3 Answers3