How to check string quotes in regex -


in app can accept strings format:

'key':'value' 'key1':'value1' 'key2':'value2'

now want write regex pattern check format write pattern:

/^'(.*)'(:{1})'(.*)?'($|\n)/gm

https://regex101.com/r/om1qo9/3

this pattern work if change string below example, work again because select first quote , last quote , string match pattern.

'key':'value','key1':'value1' 'key2':'value2'

https://regex101.com/r/om1qo9/4

the .* pattern matches 0+ chars other line break chars many possible: form current position end of line, consuming ' chars finds on way line end. if use .*? pattern, lazy quantified dot, still go through ' find valid match (a whole line @ least 4 ' chars).

so, need use negated character class here, [^'] matches char '.

/^'([^']*)':'([^']*)'$/

or - disallow empty key names:

/^'([^']+)':'([^']*)'$/

or - disallow both empty names , values:

/^'([^']+)':'([^']+)'$/

details

  • ^ - start of string
  • ' - apostrophe
  • ([^']*) - group 1: 0+ chars other '
  • ':' - literal substring ':'
  • ([^']*) - group 2: 0+ chars other '
  • '$ - ' @ end of string.

see regex demo.

note * matches 0 or more occurrences. if need match @ least one, use + instead.

to allow optional whitespaces, add \s* everywhere needed. e.g., may use

/^\s*'([^']*)'\s*:\s*'([^']*)'\s*$/

see this regex demo.


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