regex101: PCRE (Legacy) Substitution Workspace

Pro

\sany whitespace character

Positive Lookahead(?=[^"]*":\s*")

Negated Character Class[^"]*

*matches any number of characters outside the set below:

"the literal " (34₁₀ / 42₈ / 22₁₆)

":the literal text ":

\s*any whitespace character, repeated any number of times

"the literal " (34₁₀ / 42₈ / 22₁₆)

Global pattern flags

g modifier: global. Finds all matches instead of stopping after the first

m modifier: multiline. Causes ^ and $ to match the start and end of each line, not only the start and end of the string

25 tokens

Regular Expression

\s(?=[^"]*":\s*")

New

{
    "Submitter":"Fred",
    "Create Date":"2019-11-05T11:31:58.000+0000",
    "Assigned To":"Some Person",
    "Last Modified By":"Fred@acme.com",
    "A String of Four": "A String with 4 words and 3 spaces",
    "Another Test": "Four Words Appear Here",
}

Substitution

_

{
    "Submitter":"Fred",
    "Create Date":"2019-11-05T11:31:58.000+0000",
    "Assigned To":"Some Person",
    "Last Modified By":"Fred@acme.com",
    "A String of Four": "A String with 4 words and 3 spaces",
    "Another Test": "Four Words Appear Here",
}