Question

I am using Pattern.compile() to find if a text string contains two other strings. But it needs to be in one regex pattern.

For example the string must have “StringOne” and “StringTwo” in it.

I could do Pattern.compile("(StringOne StringTwo|StrinTwo StringOne"), but both strings are quite long and I want to see if I can compress it.

If I do "(StringOne )?StringTwo( StringOne)?" it would match “StringTwo” and “StringOne StringTwo StringOne”.

Answer 1

Use this regex:

^(?=.*\\bStringOne\\b)(?=.*\\bStringTwo\\b)

This uses two look-aheads anchored to start of input to assert that both strings appear somewhere

Edit:
Added word boundaries \b to ends of strings to prevent matches of one string within another, although this was not a stated requirement of the question.